No chafing. No bunching. Just pure performance.

Underwear Designed for Runners

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Running in regular underwear?
You're holding yourself back.

❌ Painful Chafing

Cotton traps moisture and creates friction with every stride. The result? Red, raw skin that makes your next run unbearable.

❌ Constant Bunching

Regular underwear rides up during runs, forcing you to adjust mid-stride. It's distracting, uncomfortable, and ruins your rhythm.

❌ Sweat Build-Up

Cotton absorbs sweat and holds it against your skin. Heavy, wet, uncomfortable - it's the opposite of what you need on long runs.

❌ Odor Issues

Trapped moisture in cotton fabrics creates the perfect environment for bacteria. That post-run smell? It doesn't have to be that way.
Stop fighting your underwear. Start chasing PBs.
8" in-seam
Boxer Brief Sport - Stallions
Boxer Brief Sport
Longer For Activity
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8" in-seam
Cloud Mesh Boxer Brief Sport - Black
Cloud Mesh Sport
Ultra-light
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6" in-seam
Boxer Brief - Black Currants
Boxer Brief
Thicker Legs
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6" in-seam
Cloud Mesh Boxer Brief - Black
Cloud Mesh Boxer Brief
Ultra-light
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4" in-seam
Trunk - Dark Grey
Trunk
Thinner Legs
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6" in-seam
Boxer Brief - Neon Strikes
Limited Editions
Thicker Legs
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Why runners choose Step One Boxer Briefs.

4x More Breathable*

Bamboo viscose allows exceptional airflow, keeping you cool and dry even during intense interval training or marathon distances.
* than 200 GSM cotton.

Superior Moisture-Wicking

Our fabric pulls sweat away from your skin faster than cotton, preventing that heavy, waterlogged feeling on long runs.

Anti-Chafe Technology

Seamless construction and UltraGlyde Panels eliminate friction points. Run 20 kms or 2 - maximum chafe protection.

Stays in Place

Engineered fit with just the right amount of stretch means no riding up, no bunching, no mid-run adjustments. Set it and forget it.

Naturally Odor-Resistant

Bamboo's natural antimicrobial properties fight bacteria and odor. Smell fresh even after your toughest training sessions.

Sustainable Performance

Organically grown bamboo that's better for you and the planet. No pesticides, minimal water, maximum performance.

What other runners say on Trustpilot

Loved by thousands of happy customers.
5/1/2026

Very comfy soft and ultra glide when running and walking

Very comfy , good fit really happy with these boxers for fitness

CJ
5/1/2026

Use them for running & they’re great!

I have started wearing the boxers during my run and they’re great. Highly recommend

Aaron
13/08/2025

Very comfortable

Very comfortable, good if you chafe while running, can hold those big coconuts in place

Taylor H
8/9/2025

Perfect for running

Perfect fit. Really comfortable. I’ve tried loads of different running underwear and these are definitely the best.

Marc Stringer
13/12/2025

After a friend recommended thought I…

After a friend recommended thought I would give these a go, wish I listened years ago when he first told me. They are perfect for running too as they dont chafe.

Ashley
25/11/2025

I was recommended these by a friend.

I was recommended these by a friend. He had bought a pair to help reduce chafing while running. I’ve worn them running and while spin cycling and they also work really well at stopping myself from catching the inside of my thigh on the adjustable seat mount. They work really well at not riding up while exercising. Will buy again.

MP

First Pair Guarantee

Still not sure? Love them or they're free. If you don't love your first pair, we'll give you a full refund.

  • Risk-free trial
  • Full refund
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You have nothing to lose but your chafing.

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Join thousands of runners who've made the switch to Step One.

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