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

The world’s most comfortable underwear for men and women

Join millions of happy customers by trying Step Ones today! Organic Bamboo viscose and patented technology fights chafe, wicks sweat and keeps you looking and feeling great. Get chuffed, not chafed.

What makes Step Ones different?

Anti-chafe technology
First pair guarantee*
Organic fabric
Ethically certified

First time here? Check out our intro-pack offer for 33% off your first pairs!

*Our first pair guarantee
We are so confident you'll love your Step Ones, we'll give you a FULL REFUND on your FIRST PAIR if you don't like them for whatever reason.
Ethically certified
All Step One factories are certified with:
- Fair Wages.
- No Child Labour.
- Fair Working Conditions.
- No Forced Labour.
100% compostable
All Step One packaging is 100% compostable because we love planet Earth as much as we love your thighs 😉
Organic Bamboo viscose
Bamboo grows faster and uses less water than cotton, making it a more sustainable option for underwear. It’s soooo breathable and wicks away sweat to keep you cool downstairs.