No regrets.Just comfort.

No regrets. Just undies.

Organically grown bamboo viscose, Ultraglyde™ panels and a 3D Comfort Pouch.

Size guide

Boxer Brief

Size	Waist cm	Waist in
S	73–80	28.5–31.5
M	80–88	31.5–34.5
L	88–95	34.5–37.5
XL	95–102	37.5–40
2XL	102–109	40–43
3XL	109–116	43–45.5
4XL	116–124	45.5–49
5XL	124–131	49–51.5
6XL	131–138+	51.5–54.5+

And the socks he steals.

The pairs that keep going missing at home. Crew, ankle or no show: reinforced heel and toe, 360° arch support and a silicone grip that stays put.

Size guide

Crew

Size	EU	Men's US	Women's US	UK
XS	35–37	3–5	5–7	3–4.5
S	38–40	5–7	7–9	4.5–7
M	40–42	7–9	9–11	7–9.5
L	42–45	9–11	11–13	9.5–11
XL	45–49	11–14	13–15	11–14

Ankle

Size	EU	Men's US	Women's US	UK
XS	35–37	3–5	5–7	3–4.5
S	38–40	5–7	7–9	4.5–7
M	40–42	7–9	9–11	7–9.5
L	42–45	9–11	11–13	9.5–11
XL	45–49	11–14	13–15	11–14

No Show

Size	EU	Men's US	Women's US	UK
XS	35–37	3–5	5–7	3–4.5
S	38–40	5–7	7–9	4.5–7
M	40–42	7–9	9–11	7–9.5
L	42–45	9–11	11–13	9.5–11
XL	45–49	11–14	13–15	11–14

The underwear brand that changed the game.

26M+Pairs sold
65K+5-star reviews
2M+Happy customers
100+Elite athletes

4.8

What customers say about Step One

Worn by real people.

Customers on why they never go back.

30 Days

First Pair Guarantee

Love your first pair or it’s free. Not convinced? Keep it and we’ll refund you in full.

Risk-free trial
Full refund
No questions asked

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Questions, answered.

What are Step One undies made of?

High-quality, organically grown bamboo viscose. It's incredibly soft, breathable and moisture-wicking, keeping you cool and dry all day long.

Boxer Brief or Trunk?

The only difference is leg length: Boxer Briefs have 3 cm more than Trunks. Boxer Briefs usually suit guys with thicker legs, Trunks guys with thinner legs. Michael wears the Boxer Brief.

How does the Ultraglyde™ panel work?

The Ultraglyde™ panels are friction-resistant panels on the inner thighs that prevent chafing and stop the legs from riding up. Your legs glide past each other rather than rubbing.

How do the socks fit?

Unisex sizing from XS to XL, in black or white. A 360° arch band and a non-slip silicone grip keep them in place, with a reinforced heel and toe for the long haul. Michael wears the crew.

How does the First Pair Guarantee work?

We are so confident you'll love your first pair of Step One underwear that if you don't, you can keep them and we'll give you a full refund. No questions asked. This applies to your first single pair purchase.

How should I wash them?

Machine wash cold with like colours. Tumble dry low or line dry in the shade. Do not bleach, iron or dry clean.

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