12 Best Running Underwear Picks That Stop Chafing (2025 Guide)

Anyone who has felt the burn of chafing during a run knows how this minor problem can ruin your workout. Chafing happens when skin rubs against skin or clothes, and sweat makes it worse when you run.

The right running underwear can save you from the pain of irritated thighs, underarms and other sensitive spots. Technical fabrics like nylon, polyester, and polyamide are a great way to get better breathability and wick away sweat. Cotton traps moisture and lets bacteria grow, so it's nowhere near as effective.

I've put many pairs to the test to help you pick the perfect underwear that stops chafing and keeps you running in comfort. This detailed guide shows you 12 running underwear options that really do the job. We looked at everything from how they handle sweat to their anti-chafe features. Now you can focus on your run instead of dealing with discomfort.

Flissie Women's Boxer Shorts

Flissie Women's Boxer Shorts are made from groundbreaking Tanboocel bamboo viscose. These shorts are a top choice for runners who want the best comfort and chafe-free running experience. The design includes several technical features that make them perfect for active wear.

Material and Construction

The bamboo fabric makes these boxer shorts special. Tests show it's 10x softer than regular cotton. The production process is eco-friendly too. The factory recycles excess water and gas, and avoids harmful carbon-disulfide during extraction. You'll find anti-chafing panels with frictionless fabric technology that stops thigh friction.

Moisture-Wicking Properties

Tanboocel bamboo viscose excels at moisture control. The fabric pulls sweat away from your skin to keep you dry while running. The material's natural antibacterial properties stop odor-causing bacteria from growing. These features are great for long runs when sweat control becomes vital.

Fit and Comfort

Runners can pick between two inseam lengths - 6" and 9" based on their needs. The 9" version hits just above your knee and gives maximum chafe protection. The 6" option works better if you prefer shorter shorts. An anti-dig waistband prevents pressure points and stays in place during movement. Sizes range from UK 8 to 30, so everyone can find their perfect fit.

Price Point

The shorts become more affordable when you buy multiple pairs. One pair costs £18, but you can save money with these deals:

• 3+ pairs: £15 each (17% savings)

• 5+ pairs: £13 each (28% savings)

• 10+ pairs: £12 each (33% savings)

Flissie shows its commitment to social causes by giving one pair to vulnerable women for every three pairs sold. Your first pair comes with a 30-day satisfaction guarantee and free size exchanges. Orders over £45 ship free in the UK, and they deliver worldwide.

Under Armour Pure Stretch Hipster

Under Armour's Pure Stretch Hipster stands out with its precise engineering and advanced technical features. Runners who need reliable performance wear will find this 3-pack underwear combines smart design with practical use.

Key Features

The Pure Stretch Hipster has super-soft stretch fabric that keeps you comfortable during runs. Laser-cut edges make up its most notable feature and create a smoother, more flattering silhouette without hems. Plus, the 4-way stretch material moves easily in every direction and lets you move freely.

A soft cotton gusset pairs with tagless construction to eliminate any irritation. The fuller back coverage works with a mid-rise waist below the waistline to give you the right coverage without limiting movement.

Comfort Level

The fabric blend of 76% Polyamide and 24% Elastane helps manage moisture well. You'll stay dry even during intense running sessions. These hipsters fit just right - not too tight or loose.

The fabric has odor control technology that reduces unwanted scents. Without traditional seams, these hipsters avoid friction points and stay hidden under your running clothes, from regular shorts to compression leggings.

Durability

The quality construction shows in several ways. The material keeps its shape after many washes and maintains the laser-cut edges. High-friction areas last longer thanks to the fuller back coverage design.

These hipsters hold up well over time. The fabric blend fights against pilling, but following care instructions matters for long-lasting wear. Machine washing works fine, but skipping fabric softeners helps keep the moisture-wicking properties intact.

A 3-pack costs £26.00, which offers good value given its technical features and durability. Some retailers sometimes sell them for £22.00 per 3-pack.

Sizes range from XS to XXL to fit different body types. Each pack has three hipsters that come in various color combinations. Runners can match them with their existing running clothes easily.

Runderwear Women's Running Briefs

Runderwear's Women's Running Briefs blend advanced engineering with comfort and chafe prevention. These briefs showcase exceptional technical features through innovative construction and smart design elements.

Anti-Chafe Technology

The life-blood of these briefs comes from their 360-degree seamless technology. Specialised machines create the entire garment from a single piece of fabric. This unique construction eliminates side seams and labels to reduce skin irritation risks by a lot. The fabric blend of 92% recycled polyamide and 8% elastane delivers a super-soft feel against your skin.

High-waisted design gives extensive coverage without limiting movement. The durable fabric with 4-way stretch enables free motion while you retain control. These briefs even come with a chafe-free guarantee, backed by detailed testing in running conditions of all types.

Breathability Features

Strategic micro-perforations throughout the technical fabric enhance ventilation. These engineered zones optimize airflow and help regulate core temperature, whatever the running conditions. The material shows superior moisture-wicking capabilities and actively pulls sweat away from your skin to keep you dry.

Lightweight construction works exceptionally well during intense runs. One athlete completed a four-day 100-mile run without any chafing.

Size Range

The detailed size options range from UK 8-10 (Small) to UK 20-22 (XXL). The size guide has international conversions:

• UK sizes match US 4-6 through 16-18

• European measurements span 36-38 to 48-50

• Japanese sizing covers 9-11 to 21-23

Each pair costs £18.00. You can save 20% with a three-pair multipack at £43.20.

Care is simple - machine wash at 40°C. Wash with similar colors and skip the tumble dryer to protect the fabric's technical properties. Users report excellent durability, with some pairs lasting 8+ years of regular use.

ExOfficio Give-N-Go Sport Mesh

ExOfficio's Give-N-Go Sport Mesh collection revolutionises traditional underwear with its innovative design. The breathable mesh construction performs exceptionally well during high-energy activities. Runners looking for reliable performance wear will find these an excellent choice.

Odour Control

The fabric's antimicrobial treatment works remarkably well to minimise unwanted odours. Tests show these briefs stay fresh even after multiple days of wear. While the odour-proofing treatment gradually fades with prolonged use, it manages to keep its effectiveness throughout the garment's main lifecycle.

Quick-Dry Technology

Sport Mesh 2.0 brings impressive upgrades from its previous version. It offers 4 times more breathability and 50% better moisture-wicking capabilities. The quick-drying properties have improved by 24%. Your underwear will dry completely within 2.5 hours after washing.

The ultralight mesh fabric regulates temperature perfectly during intense activities. A wide, shape-retaining waistband and flatlock seams prevent stretching or losing form. Runners will appreciate the 4-way stretch material that allows unrestricted movement during long sessions.

Travel-Friendly Features

You can choose from three distinct inseam lengths in the Sport Mesh collection:

• 3-inch (£23.82)

• 6-inch (£25.41)

• 9-inch (£27.00)

Sizes range from S through 2XL to fit a variety of body types. Frequent runners will appreciate the durable synthetic fabric construction as a reliable investment. A snug active fit and lower rise work especially well for high-energy activities.

These briefs excel in various conditions. Tests in multiple environments, from heated hotel rooms to freezing temperatures, show consistent performance. The silky, soft material resists stains well, making it practical for extended wear.

Your color options include:

• Lagoon/Steel Blue

• Steel Onyx/Black

• Navy/Skydiver

• Black/Black

ExOfficio lets you return unused items with tags attached within 60 days and covers return shipping costs. This helps customers find their perfect size without risk, though sizing down typically gives the best fit.

BAM Bamboo Seamless Briefs

BAM's Seamless Briefs blend performance with eco-friendly manufacturing. These running underwear stand out in the athletic wear market with their advanced features and environmentally conscious production methods.

Sustainable Materials

The briefs combine 78% bamboo viscose, 15% polyamide, and 7% elastane. The manufacturing uses a closed-loop process that recycles excess materials to reduce environmental impact. Bamboo viscose needs very little water to produce. The plant helps the environment by absorbing CO2 and creating 35% more oxygen than other trees.

Temperature Regulation

The unique micro-space design in BAM's seamless briefs keeps your body at the right temperature in hot and cold weather. The bamboo fabric absorbs moisture twice as well as regular cotton. This makes these briefs a great choice for long runs since they pull sweat away from your skin quickly.

Antimicrobial Properties

Bamboo fabric naturally fights bacteria and stops odors from developing. You won't find any synthetic antimicrobial treatments here, which makes these briefs perfect for sensitive skin. The fabric stays fresh during intense workouts without needing harsh chemicals.

The design eliminates chafing with no seams on the sides, back, or waistline. Soft elastic at the waist and legs keeps everything secure yet comfortable. The fabric resists static, so you won't experience any clinging or static shocks.

The briefs come in sizes XS to XXL to fit different body types. Here's what they cost:

• Single pair: £18.00

• Three-pack: £43.20 (20% savings)

• Free UK delivery when you spend over £50.00

Taking care of these briefs is simple. Just machine wash at 40°C, but skip the fabric softener to keep the technical features working properly. BAM gives you a 30-day satisfaction guarantee and free size exchanges if needed.

These briefs keep their shape and performance even after many washes. The bamboo fabric feels as soft as cashmere mixed with silk, giving you lasting comfort. BAM suggests going up a size if you're between sizes because the seamless design provides gentle compression without limiting your movement.

Modibodi Active Running Shorts

Modibodi Active Running Shorts bring a groundbreaking change to running comfort by combining period leak-proof technology with eco-friendly design. These shorts deliver exceptional performance when runners need reliable protection during workouts.

Leak-Proof Technology

A patented three-layer system uses merino wool as the top layer to wick moisture away from skin. The breathable built-in 3mm Modifier Technology lining absorbs up to 15ml of fluid - as much as 2-3 tampons. Hi-tech waterproof seals make up the bottom layer and provide maximum protection against leaks.

Moisture Management

The outer fabric gets a specialised moisture-wicking treatment to stay dry during intense activities. Merino wool naturally dries quickly and controls odour, which keeps runners fresh through marathon sessions. The lightweight yet supportive structure comes from a blend of 74% recycled nylon and 28% elastane.

Environmental Impact

Modibodi shows its steadfast dedication to sustainability through smart material choices. The shorts use 78% recycled material from pre-consumer factory waste. The brand's B Corporation certification proves it meets high standards of social and environmental performance. Their focus on renewable materials in design helps reduce environmental impact.

These practical features make the shorts highly functional:

• Twin side pockets and a hidden back zip pocket for essentials

• Wide waistband for better comfort and stability

• Sizes from XS to 2XL for a great fit

Taking care of these shorts is simple. Just rinse in cold water, machine wash gently, and air dry. New customers get a 60-day trial period with a 30-day return policy. The shorts cost £38.71, and you can split payments into four interest-free installments.

Runners verify these shorts work well even during half-marathon distances. The combination of leak-proof protection and moisture control helps runners stay confident through long running sessions.

Oiselle Flyout Briefs

Oiselle's Flyout Briefs bring a revolution in athletic comfort with their innovative HoverFit™ technology. These high-performance briefs excel at moisture management and prevent chafing in running conditions of all types.

Performance Features

The Flyout HoverFit™ fabric makes these briefs stand out with its blend of 65% recycled polyester, 32% lyocell, and 3% spandex. This technical combination creates a lightweight, adaptive material that skims the body during movement. The fabric's specialised knit construction blends hydrophobic and hydrophilic yarns to provide superior wicking control.

Comfort During Long Runs

The seamless construction eliminates friction points, which makes these briefs perfect for long-distance running. A unique fiber structure helps the fabric breathe by pulling moisture to the surface for quick evaporation. The briefs keep their performance level even when hydration bladders leak, and runners stay warm and comfortable according to extensive testing.

Size Inclusivity

The brand shows its steadfast dedication to size diversity with sizes ranging from 2 to 26. Their sizing system has been thoughtfully updated to fit more body types. Here are the measurement details:

• Size 2-4: Matches previous XS-S measurements

• Size 6-8: Lines up with former S-M sizing

• Size 10-12: Corresponds to previous M-L measurements

Full coverage design maintains mobility while an internal drawcord allows fit adjustments. The manufacturer suggests picking your true size based on their detailed measurement guide that factors in both waist and hip measurements.

New Balance Breathe Hipster

New Balance's Breathe Hipster underwear strikes the perfect balance between performance and practicality with its ultra-lightweight mesh construction. This running underwear gives you comfort and great value for your money.

Value for Money

You can grab a three-pack of the Breathe Hipster for £26.00. The price is a steal when you look at its technical features and how long it lasts. New Balance offers easy payment options among other perks like free shipping on orders over £100. Their 30-day return policy lets you return unworn items with tags intact.

Technical Features

The ultra-lightweight mesh fabric blends 90% nylon with 10% spandex to create an incredibly soft and stretchy material. The premium breathable mesh shows off its moisture-wicking capabilities by pulling sweat away from your skin quickly. The fused edges and tagless design eliminate visible panty lines and give you a smooth, flattering fit.

These athletic features make it stand out:

• Strategic ventilation zones for better comfort

• Shape-retaining waistband that keeps everything in place

• Specialised mesh construction for maximum breathability

Durability Rating

Our long-term tests show these hold up well in high-wear areas. The fabric keeps its technical properties wash after wash, as long as you follow the care instructions. Users say performance stays consistent even after lots of use, and the laser-cut edges don't lose their shape.

The size range runs from XS to XXL to fit all body types. The measurement guide helps you pick the right size - just go with your usual size. These perform reliably in all kinds of running conditions and stay comfortable through intense workouts.

The care is simple - just toss them in the washing machine on normal settings. Skip the fabric softener to keep the moisture-wicking feature working properly. Taking good care of them helps maintain their ultra-lightweight properties and technical features for longer.

Tracksmith Brighton Base Layer

Tracksmith's Brighton Base Layer sets new standards for running base layers by combining premium craftsmanship with innovative design. This versatile piece delivers exceptional performance in all kinds of running conditions.

Premium Materials

The Brighton Base Layer features an engineered Merino mesh construction with 16.5 micron wool blend. The fabric's design includes a more open knit around the core area among other closed knit sleeves to boost warmth distribution. European seamless construction removes all possible irritation points. The result feels like a second skin that's as comfortable as your favorite sleepwear.

Performance Benefits

Strategic engineering of the mesh design helps regulate temperature effectively. The fabric keeps you dry even during your toughest training sessions. The garment's sweat management stands out - tests at 20°F with wind showed runners stayed comfortable with just the Brighton and a light windbreaker.

This base layer really shines when it comes to layering options. Runners report great results at various temperatures:

• 20°F: Works great with a light windbreaker

• 30°F with wind: Perfect as a standalone piece for high-intensity workouts

• 40°F: Makes an ideal single layer for tempo runs

Style Elements

The seamless design creates a flattering fit without feeling too tight. You can get the Brighton Base Layer for £102.45 in sizes ranging from S through XL. Taking care of it is simple - a regular machine wash brings back its technical properties.

The base layer's performance makes its premium price tag worth every penny. Long-term users praise its durability. Many have managed to keep the quality intact even after three years of regular use - running 3-4 times weekly in cold weather. Knowing how to regulate temperature while preventing overheating makes this piece valuable for runners who need reliable gear in changing weather conditions.

Lululemon InvisiWear Briefs

Lululemon's InvisiWear Briefs disappear completely under your running gear thanks to their advanced design. These briefs excel at moisture control and give exceptional comfort when you're pushing through intense runs.

Seamless Construction

The tight knit design creates a snug feel without limiting your movement. A wide front panel gives full coverage, and the mid-rise design sits exactly 1" below regular mid-rise bottoms. The design eliminates side seams completely, which makes these briefs practically invisible under your running clothes.

Sweat-Wicking Properties

The technical fabric has 71% Nylon and 29% Lycra® Elastane, which pulls moisture away from your skin quickly. This fabric mix dries fast and keeps you comfortable. A breathable cotton gusset adds airflow right where you need it, so you stay comfortable during long runs.

Fit Guide

Sizes range from XS (UK 6-8) to XXL (UK 20-22). The manufacturer suggests picking your regular size based on their measurement guide. The four-way stretch material moves with your body and keeps its shape thanks to added Lycra® fiber.

You can buy these briefs in different packs:

• Three-pack: £48.00

• Five-pack: £78.00

These briefs are easy to care for. Just machine wash them in cold water, tumble dry on low, and skip the bleach and iron. The fabric holds up well and keeps its technical properties even after many washes.

Runners have verified these briefs work great, even during marathon training. The seamless edges and mid-rise waist stay in place without riding up or bunching. Some runners suggest buying one size smaller for better compression since the material loosens slightly after the first few wears.

Nike Dri-Fit ADV Mid-Rise Brief-Lined Running Shorts

Nike's Dri-FIT ADV Team collection expands the possibilities of athletic apparel technology with a breakthrough in running underwear design. This premium line builds on Dri-FIT technology's foundation through athlete testing and digital design computation.

Innovation Features

Dri-FIT ADV technology pairs moisture-wicking fabric with state-of-the-art engineering that keeps you dry during intense workouts. The system's body-mapped engineering customises materials pixel by pixel, based on athlete data from LeBron James Innovation Center. The fabric stands out with its breathability - four times better in high-heat areas.

Competition Performance

Lab tests have helped create garments with cooling zones right where athletes generate heat and sweat. The material adapts to how you move and performs consistently in extreme conditions. Sport-specific engineering gives optimal functionality for runners of all levels.

Size and Fit

Recent changes to the sizing structure will give a better fit. Here's what you need to know:

• Go one size down if you want compression fit

• El Salvador-made pieces match standard sizes

• Vietnam-made items run bigger

These garments come with state-of-the-art construction features:

• Body-mapped ventilation zones

• Hi-tech waterproof seals

• Micro-perforations in key areas

The collection's durability stands out - technical properties last through many washes. Cold water washing helps keep the moisture-wicking features intact. You can find sizes from XS to 3XL, priced between £99.99 and £124.99 based on style.

State-of-the-art engineering lets athletes focus on their performance instead of comfort. Evidence-based design elements and athlete feedback create apparel that delivers top performance in all running conditions.

Brooks Moving Comfort

Brooks Moving Comfort shows technical expertise through its innovative GuideRails™ support system. This advanced technology manages to keep joints moving properly during runs. The system sets new standards in performance underwear design.

Chafe-Free Design

The design uses specialized DNA Loft v3 cushioning, which is nitrogen-infused foam that delivers superior comfort and reduces friction. A seamless construction eliminates irritation points, while strategically placed micro-perforations let air flow freely. The fabric shows impressive durability and keeps its technical properties even after heavy use.

Support Level

GuideRails™ support system is a most important breakthrough in running comfort. This unique technology cuts down excess movement with denser foam pieces along the sides. The system reduces erratic knee movement from the ground up and provides support that doesn't feel restrictive.

Key performance elements include:

• DNA Tuned cushioning with dual-sized cell technology

• Better stability from a secure heel cup design

• A streamlined fit that allows free movement

Washing Instructions

Taking care of these garments is vital to preserve their technical features. The maker suggests:

• Regular machine washing at 40°C

• No fabric softeners to keep moisture-wicking properties

• Air drying away from heat

These garments are tough and last long with proper care. Users report consistent performance even after 8+ years of regular wear. The fabric handles normal washing well and keeps its shape through multiple cycles.

Multi-pack options cost between £22.00 and £26.00, which offers great value given their advanced features. Sizes range from XS to XXL to fit different body types. The maker's detailed 60-day satisfaction guarantee covers return shipping for unused items.

Comparison Table

Brand & Model	Material Composition	Key Features	Moisture Management	Size Range	Price (£)	Care Instructions
Flissie Women's Boxer Shorts	Tanboocel bamboo viscose	Anti-chafing panels, low-friction fabric technology, comfort-fit waistband	10x more absorbent than cotton, natural antibacterial properties	UK 8-30	£18 (single), £12-15 (bulk)	Machine washable, avoid fabric softeners
Under Armor Pure Stretch Hipster	76% Polyamide, 24% Elastane	Laser-cut edges, 4-way stretch, no-tag design	Advanced sweat-wicking technology, odor control	XS-XXL	£26 (3-pack)	Machine wash, avoid fabric softeners
Runderwear Women's Running Briefs	92% recycled polyamide, 8% elastane	360-degree smooth construction, no-chafe guarantee	Micro-perforations for airflow, enhanced wicking	UK 8-22	£18 (single), £43.20 (3-pack)	Machine wash 40°C
ExOfficio Give-N-Go Sport Mesh	Synthetic mesh blend	Flat seams, shape-retaining waistband	4x more breathable, dries in 2.5 hours	S-2XL	£23.82-27.00	Machine washable
BAM Bamboo Seamless Briefs	78% bamboo viscose, 15% polyamide, 7% elastane	Smooth construction, gentle elastication	2x more absorbent than cotton, natural antimicrobial	XS-XXL	£18 (single), £43.20 (3-pack)	Machine wash 40°C
Modibodi Active Running Shorts	74% recycled nylon, 28% elastane	Three-layer protection system, twin side pockets	Merino wool top layer, handles up to 15ml fluid	XS-2XL	£38.71	Rinse cold, gentle machine wash
Oiselle Flyout Briefs	65% recycled polyester, 32% lyocell, 3% spandex	HoverFit™ technology, internal drawcord	Balanced hydrophobic and hydrophilic yarns	Size 2-26	£20.65	Cold wash, tumble dry low
New Balance Breathe Hipster	90% nylon, 10% spandex	Clean edges, no-tag design	Light mesh construction, quick wicking	XS-XXL	£26 (3-pack)	Machine washable, standard settings
Tracksmith Brighton Base Layer	Merino mesh (16.5 micron wool blend)	European smooth construction, targeted mesh zones	Smart temperature control	S-XL	£102.45	Machine washable
Lululemon InvisiWear Briefs	71% Nylon, 29% Lycra® Elastane	Smooth construction, wide front panel	Active moisture control technology	UK 6-22	£48 (3-pack)	Cold wash, tumble dry low
Nike Dri-FIT ADV Team	Not mentioned	Body-mapped ventilation, secure waterproof seals	4x better airflow in heat zones	XS-3XL	£99.99-124.99	Cold wash
Brooks Moving Comfort	Not mentioned	GuideRails™ support system, DNA Loft v3 cushioning	Strategic air vents	XS-XXL	£22-26	Machine wash 40°C

Conclusion

I've tested dozens of running underwear options and can tell you that the right undergarments make a real difference in how comfortable and effective your runs are. Flissie Women's Boxer Shorts came out on top in my tests. Their bamboo fabric technology works great and stops chafing better than other brands. Buy Flissie Boxers here to get that perfect mix of comfort and performance.

You'll find running underwear in all price ranges. Under Armor sells affordable multi-packs while Tracksmith focuses on premium base layers. Each brand brings something different to the table with their own tech - from seamless designs to moisture-wicking fabrics and smart ventilation systems. Of course, you need to think over what works best for you based on how far you run, your weather conditions, and what you want to spend.

The perfect running underwear feels like it's barely there. This lets you focus on your run instead of adjusting uncomfortable gear. My tests show that the right fabric, smart ventilation, and proper fit are the foundations of preventing chafe marks and staying comfortable on long runs. The best pairs bring all these features together while lasting long enough to justify their cost.

FAQs

Q1. What type of underwear is best for preventing chafing while running? Moisture-wicking fabrics like bamboo, nylon, polyester, or spandex are ideal for preventing chafing. Look for underwear with seamless construction, longer inseams, and features like anti-chafe panels. Boxer briefs tend to provide good coverage and support to minimize friction.

Q2. How can I stop my underwear from chafing on long runs? Choose underwear made of technical fabrics that wick moisture and dry quickly. Opt for styles with flat seams and longer inseams. Apply an anti-chafing lubricant or balm to problem areas before running. Make sure your underwear fits properly without bunching or riding up.

Q3. Are there any sustainable options for running underwear? Yes, several brands now offer eco-friendly running underwear. Look for options made from recycled materials, bamboo viscose, or merino wool. Some sustainable picks include BAM Bamboo Seamless Briefs and Modibodi Active Running Shorts, which use recycled fabrics.

Q4. What features should I look for in running underwear for hot weather? For hot conditions, prioritise breathability and moisture management. Look for underwear with mesh ventilation zones, quick-drying fabrics, and odour control technology. Lightweight, seamless styles with minimal coverage can help keep you cool.

Q5. How often should running underwear be replaced? The lifespan of running underwear varies based on use and care, but generally, replace them every 6-12 months with regular use. Look for signs of wear like stretched-out elastic, holes, or diminished moisture-wicking ability. Rotating between multiple pairs can help extend their life.