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

Men's Bamboo Viscose Underwear

Shop NiteKnit™ Sleepwear

Which Step One Underwear should you choose?

Best Seller

Men's Bamboo Underwear Boxers in black and grey - Model:Skyler

Boxer Brief

6 inch in-seam
Anti-chafe Ultraglyde panels
Sweat wicking bamboo viscose fabric
Suits thicker legs
3D comfort pouch

Shop Boxer Brief

Trunk

4 inch in-seam
Anti-chafe Ultraglyde panels
Sweat wicking bamboo viscose fabric
Suits Thinner Legs
Good for shorter guys

Shop Trunk

[EXP-A] Black Underwear with Fly at Step One - Model:Angus

Boxer Brief Fly

6 inch in-seam
Anti-chafe Ultraglyde panels
Sweat wicking bamboo viscose fabric
Easy access front fly
3D comfort pouch

Shop Boxer Brief Fly

Boxer Brief Sport

8 inch in-seam
Anti-chafe Ultraglyde panels
Sweat wicking bamboo viscose fabric
Longer for activity
3D Comfort Pouch

Shop Boxer Brief Sport

Why Step One Underwear?

Shop Boxer Brief

Shop Cloud Mesh

Shop Long Johns

FAQ's

What's the difference between a Boxer Brief and Trunk?

The only difference between the two is that Boxer Briefs have 3 cm more leg length than the trunks.

What type of underwear is best for me?

It depends on your preference! We have a range of underwear that will suit anyone's body type, shape, and height.

Here's our buying guide:
Boxer Brief - Designed for men with thicker legs
Trunk - Shorter length (4" inseam) - ideal for men with thinner legs
Boxer Brief Fly - Easy access fly, perfect for corporate or fomal occasions
Boxer Brief Sport - 8" inseam - extra length for strenuous exercise
Long Johns - Keeps you warm & dry, perfect for colder days and activity

What underpants should I choose if I play sport?

All our underwear is built for movement, but if you’re into sport we recommend the Boxer Brief Sport to prevent ride up for extreme movement, Cloud Mesh for sports that can get hot and need extra breathability and Long Johns for winter.

First Pair Guarantee

We are so confident you'll love your Step Ones, we'll give you a full refund on your first opened and worn pair if you don't like them for any reason.

Free shipping on all orders!

Free shipping on all orders in Australia... how good!

Easy Returns

Picked the wrong size by mistake? No problem. On top of our first pair guarantee we also offer returns/exchanges on all unopened products.

Customer Service

Buy with confidence, our dedicated customer service team is available 24/7 to answer any questions you have!

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Men's Bamboo Viscose Underwear

Which Step One Underwear should you choose?

Why Step One Underwear?

FAQ's

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Notifications

Men's Bamboo Viscose Underwear

Which Step One Underwear should you choose?

Why Step One Underwear?

FAQ's