Bamboo Viscose Underwear
Soft, breathable bamboo viscose underwear with anti-chafe panels, for men, women and kids.
- Free shipping
- 30-day First Pair Guarantee
Men's best sellers
Shop all men's
Men's best sellers
Shop all men's
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Boxer Brief
Grey
Suits thicker legs
$22
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Trunk
Navy
Suits thinner legs
$22
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Boxer Brief Fly
Black & Grey
Easy access front fly
$22
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Boxer Brief Sport
Hulks
Longer for activity
$22
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Crew Sock
White
$13
Limited Edition
Shop all limited edition
Limited Edition
Shop all limited edition
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Sapphires
$22
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Apocalypse
$22
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Ember Wave
$22
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Poseidons
$22
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Heart Racers
$22
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Eclipse
$22
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Dark Rose
$22
Big & Tall
Shop Big & Tall
Big & Tall
Shop Big & Tall
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Boxer Brief to 6XL
Grey
4XL to 6XL in stock
$22
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Boxer Brief 3XL
Grey
3XL in stock
$22
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Boxer Brief Fly
Navy
Up to 4XL
$22
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Boxer Brief Sport
Hulks
Up to 3XL
$22
Women's best sellers
Shop all women's
Women's best sellers
Shop all women's
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SmoothFit Bikini Brief
Espresso-Tini
Classic cut
$17
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Body Shorts
Anti-chafe coverage
$17
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SmoothFit Padded Bra
Chic Champagne
Lift and support
$26
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SmoothFit Full Brief
Espresso-Tini
Full coverage
$19
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SmoothFit Thong
Blue Lagoon
Less coverage
$17
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Crew Sock
White
$13
Everyday
Shop all women's
Everyday
Shop all women's
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SmoothFit Bikini Brief
Espresso-Tini
Classic cut
$17
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SmoothFit Full Brief
Espresso-Tini
Full coverage
$19
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SmoothFit Thong
Blue Lagoon
Less coverage
$17
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SmoothFit Padded Bra
Chic Champagne
Lift and support
$26
Active & Shapewear
Shop Body Shorts
Active & Shapewear
Shop Body Shorts
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Body Shorts
Anti-chafe coverage
$17
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SmoothFit Boyleg
Chic Champagne
Moderate coverage
$19
Junior Trunk
Shop all kids
Junior Trunk
Shop all kids
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Stormz
$13
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Black & Grey
$13
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Navy
$13
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Snow Worries
$13
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Purple
$13
Match with Mom & Dad
Match with Mom & Dad
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Mom's Body Shorts
Tap Shoe black
$17
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Dad's Trunk
Black & Grey
Suits thinner legs
$22
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Dad's Boxer Brief
Black & Grey
Suits thicker legs
$22
Real Results from Real Customers
What customers say about Step One.
TrustScore 4.5
30-day First Pair Guarantee
Love them or they're free. If you don't love your first pair, we'll give you a full refund.
Frequently Asked Questions
Why switch to bamboo underwear?
Our men's underwear and women's underwear are made from viscose derived from bamboo, a fabric that's breathable, super soft and moisture-wicking.
How do I choose the right size?
Every product page has a size chart and a fit finder. If you're between sizes, we suggest sizing up.
Is there a guarantee if I don't love them?
Yes. If you don't love your first pair, we'll give you a full refund on it, for whatever reason, within 30 days.
Bamboo underwear for men and women
Comfortable underwear starts with the fabric. Our range of bamboo viscose underwear for men and women is soft, breathable and moisture-wicking, with anti-chafe panels that keep the legs in place.
The range includes men's boxer briefs, trunks, boxer briefs with a fly and longer sport boxer briefs, plus women's bikini briefs, full briefs, boylegs, thongs, body shorts and padded bras. Mix and match any style and save when you buy 3 or more.
Free shipping on every US order, and a 30-day First Pair Guarantee: if you don't love your first pair, we'll refund it.