FOR women in motion

Most performance underwear is made from toxic plastics. Yours doesn't have to be.

Through every squat, sprint, stretch, and step, your underwear may be releasing toxins.

MINDFUL MOVEMENT

What touches your skin matters most when you sweat.

Heat, sweat, and friction are part of every workout. As your body warms up, skin becomes more permeable and sensitive. What sits against your skin during movement matters more than most people think. Yet that layer is often made from synthetic fibers like polyester, nylon, and spandex, finished with dyes and chemical treatments, sitting directly against some of the most delicate, absorbent skin on the body.

THE LAYER WORTH GETTING RIGHT.

Underwear designed for life in motion.

01

Breathes when you sweat

Synthetic underwear trap heat and moisture, shifting pH and feeding odor. Natural fibres more breathability and less room for irritation .

02

Stays put, never digs

Designed for performance, without the chafing, wedgies, pinching and digging, so you can focus on movement.

03

Zero hormone-disruptors

Synthetic activewear has tested up to 22× California's BPA safety limit. Kiseau is made without BPA, PFAS, or endocrine- disrupting finishes.

04

Microbiome balancing

Less trapped moisture means less room for bacteria to thrive. Your body stays cool, dry, and in balance, naturally.

Batch 002

Made to move.

Breathable organic cotton, infused with Icelandic seaweed. Designed like performance-wear, naturally made to move with you.

Free shipping over $100 · Made in small batches

Kiseau Terracotta High Waist Brief and Bralette front detail — seaweed-infused organic cotton underwear
the last piece of the puzzle

You filtered your water. You read your labels. You changed your skincare.

Your underwear deserves the same intentional care.

detox your workout underwear

70% cotton. 23% seaweed. 7% degradable stretch. That's it.

No mystery blends, no "performance finishes." Nothing flagged for endocrine disruption. Free of azo dyes and PFA's.

Ingredients
GOTS Certified Organic Cottongrown without pesticides. Always non-gmo. 70%
SeaCell™ — Icelandic Seaweed & Eucalyptusinfused with vitamins, antioxidants, ocean minerals 23%
ROICAâ„¢ V550 Japanese ElastanePFAS-free, C2C Gold, soil-degradable 7%
Synthetic dyes, BPA, PFAS, plastic packaginggrown without pesticides 0%
Seams: Aneflex™ ECO100 — GRS-certified recycled, OEKO-TEX® Class 1 (the baby-safe standard).
for the daily mover

From workouts to workdays.

Silky, cooling, no chafe, no fuss. Designed in natural fibers for comfort, performance, and breathability.

  • cooling say goodbye to heat build up
  • fresh odor-resistant the natural way with airflow, not chemicals
  • smooth flat seams and silky soft fabric
the 002 collection

Four fits, Four Colors.

Kiseau bralette in terra cotta — sustainable women's lingerie made from Icelandic seaweed-infused organic cotton, flat lay front view Kiseau Terracotta High Waist Brief and Bralette front detail — seaweed-infused organic cotton underwear

Everyday Bralette

$52 · S–L
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Kiseau high waist brief underwear in terra cotta — sustainable women's underwear made from Icelandic seaweed-infused organic cotton, flat lay front view Kiseau Terracotta High Waist Brief and Bralette front view — seaweed-infused organic cotton underwear and lingerie

High Waist Brief

$29 · XS–XL
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Kiseau cheeky bikini underwear in terra cotta — sustainable women's underwear made from Icelandic seaweed-infused organic cotton, flat lay front view Kiseau Terracotta Cheeky Bikini and Bralette front view — seaweed-infused organic cotton underwear and lingerie

Cheeky Bikini

$28 · XS–XL
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Kiseau classic thong underwear in terra cotta — sustainable women's underwear made from Icelandic seaweed-infused organic cotton, flat lay front view Kiseau Terracotta Classic Thong and Bralette reclined back view with Kiseau logo tag — seaweed organic cotton

Classic Thong

$27 · XS–XL
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from women who move

Tested for performance in real life

"Every time I wear Kiseau undies it feels SO silky, smooth and cooling down there…Perfect pairing for my new cotton yoga fit."
Lara · Verified Customer
"As an avid cyclist in the summer, riding my bike wearing natural underwear has helped me focus better. Less time shifting to adjust, and more time spent biking. "
Katie Lambert · Verified Customer
"I sweat a lot during my workouts, and wearing polyester underwear makes me even hotter. Even if I sweat wearing Kiseau, I don’t get that icky feeling anymore.
Ann · Verified Customer

Made for women in motion

Customer review natural living woman wearing Kiseau underwear comfortable toxic free
whenever you're ready

Move through your day a little lighter.

Shop the collection