Best Underwear for Rugby 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 chafing. No bunching. Just pure performance.

Underwear Designed for Rugby

Shop Rugby Underwear

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

❌ Painful Chafing

Cotton traps moisture and creates friction with every stride. The result? Red, raw skin causing pain that impacts your performance.

❌ Constant Bunching

Regular underwear rides up during activity, forcing you to contently adjust. It's distracting, uncomfortable, and ruins your focus.

❌ Sweat Build-Up

Cotton absorbs sweat and holds it against your skin. Heavy, wet, uncomfortable - it's the opposite of what you need to perform at your peak.

❌ Odor Issues

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

Focus on the game, not adjusting your underwear.

Why rugby players choose Step One Boxer Briefs.

4x More Breathable*

Bamboo viscose allows exceptional airflow, keeping you cool and dry even during intense games.
* than 200 GSM cotton.

Superior Moisture-Wicking

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

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 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 or games.

Sustainable Performance

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

Best pants ever.

These are literally the best pants I have ever had. Comfy, cool and no chaffing after hours of walking. I cannot recommend them enough especially if you have e rugby players thighs like me

Pretty Awesome Pants

I bought these for my son who has pretty chunky rugby legs and he is super impressed with the quality, fit and length.

Great items ordered for hubby & 2 sons all rugby players with thighs almighty! They love the feel, fit and comfort step one gives them! Well keep buying and love the special designs! Thank you for quick delivery and amazing underwear 😁👍🏻🫶🏽

Excellent pants and even better…

Excellent pants and even better customer service. My son loves these pants and that he can get longer, he is a rugby player with large thighs and they don’t ride up like standard boxer trunks. I ordered some for my husband to try that were too small, their responses were super fast and efficient, I got my refund processed straight away and a larger size ordered.

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

Shop Boxer Briefs