Best Underwear for Hiking 2026 | Anti-Chafe Bamboo Underwear

Size	AU/NZ	UK	US
XS	8A 8B 10A	30A 30B 32A	30A 30B 32A
Small	8DD 10B 10C 10D 10DD 12A 12B	30DD 32B 32C 32D 32DD 34A 34B	30DD 32B 32DD 32C 32D 34A 34B
Medium	12C 12D 12DD 12E 14A 14B	34C 34D 34DD 34E 36A 36B	34C 34D 34DD 34DDD 36A 36B
Large	14C 14D 14DD 14E 16A 16B 16C	36C 36D 36DD 36E 38A 38B 38C	36C 36D 36DD 36DDD 38B 38C
XL	16D 16DD 16E 18A 18B 18C 18D	38D 38DD 38E 40A 40B 40C 40D	38D 38DD 38DDD 40A 40B 40C 40D

Size	AU Size	UK Size	Waist (cm)
XS	04-06	00-02	60
Small	08-10	04-06	64
Medium	12-14	08-10	68
Large	16-18	12-14	72
XL	20-22	16-18	76
2XL	24-26	20-22	80

Size	Waist (cm)	Waist (in)
2XS / (Size 4/8)	53-56	21-22
XS / (Size 8/12)	57-66	23-26
Small	67-76	27-30
Medium	77-86	31-34
Large	87-97	35-38
Extra Large	98-107	39-42
2XL	108-115	43-45
3XL	116-125	46-49
4XL	126-133	50-52
5XL	134-143	53-56
6XL	144-150	57-59

Size	Waist (cm)	Waist (in)
4XS (Age & Size 3-4)	40-44	15-17
3XS (Age & Size 5-6)	45-51	18-20
2XS (Age & Size 7-8)	52-59	21-22
XS (Age & Size 9-11)	60-69	23-26
S (Ages & Size 12-14)	70-76	27-30

SHOP MEN'S SHOP WOMEN'S SHOP JUNIORS

No friction. No chafing. No bunching.

Underwear Designed for Hiking

Shop Hiking Underwear

Hiking in regular underwear?
Don't let chafing and sweat hold you back.

❌ Painful Chafing

Cotton traps moisture and creates friction with every stride. The result? Red, raw skin that makes hiking painful.

❌ Constant Bunching

Regular underwear rides up during hikes, forcing you to adjust constantly. 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 hikes.

❌ Odor Issues

Trapped moisture in cotton fabrics creates the perfect environment for bacteria. That post-exercise smell? It doesn't have to be that way.

Enjoy the outdoors without worrying about your underwear.

Why hikers choose Step One Boxer Briefs.

4x More Breathable*

Bamboo viscose allows exceptional airflow, keeping you cool and dry even on strenuous hikes.
* 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 hikes.

Anti-Chafe Technology

Seamless construction and UltraGlyde Panels eliminate friction points. Hike 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-hike adjustments. Set it and forget it.

Naturally Odor-Resistant

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

Sustainable Performance

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

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

Shop the Range

You have nothing to lose but your chafing.

Good quality underwear- great colours!

Good quality underwear ( had for a few months now) and good to see less harmful packaging being used. They fit well- hugging but not digging in and come down low enough on the bottom to be comfortable. Really good for activities like walking/ hiking as good coverage when changing- can look like shorts even!

Bought 1 mesh cloud boxer to try and…

Bought 1 mesh cloud boxer to try and was very impressed with the comfort and quality ended up ordering another 10 and wouldn’t go back to regular boxers now great for walks and hiking

The best boxer

Excellent and extremely comfortable boxers. They make a huge difference for long distance hiking. Delivered very quickly and particularly good value during one of their sales. Can’t recommend highly enough!

Fantastic

Fantastic trunks, great for hiking long distances.

The best underwear for active people

The best underwear for active people. I wore these on my last deployment, and found that they are awesome for working out, hiking, golf, etc.

Most comfortable boxers I’ve ever…

Most comfortable boxers I’ve ever owned. I didn’t think underwear could make this much difference, but Step One proved me wrong. The fabric is insanely soft, the fit is perfect, and the longer leg with the “UltraGlyde” panels really does stop chafing. I wear them for work, gym, and hiking — zero riding up. Worth every cent.

Ready to Transform Your Hikes?

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

Shop Boxer Briefs