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Model in Kiseau Natural Undyed Classic Thong, laughing as a dog nuzzles her, wide rock shelf beside the sea, seaweed-infused organic cotton

Care for your body, its your forever home

We're creating a safe space for you.

Worn mural of a red figure on a stone wall with visible wear and tear.

Centuries of Wisdom

Our roots are natural

Across many cultures, natural fabrics have always been the norm. Yet today, finding underwear made from breathable, non-toxic fibers is surprisingly difficult.

We're bringing back what our bodies have always known. Intimate wear made with natural, skin-loving materials that support comfort, breathability, and everyday wellbeing.

why we do what we do

Detoxing your wardrobe

So many women are navigating hormone imbalances, fertility challenges, autoimmune conditions, and chronic illness. As we learned more about endocrine disruptors and other chemicals hidden in everyday clothing, we knew there had to be a better way.

We make in small batches

The Antidote to Fast Fashion

The apparel industry is one of the world's largest unseen polluters, contaminating our waterways, our ecosystems, and even our bodies. Kiseau exists to research, innovate, and create healthier next-to-skin essentials. Because what we wear every day should be an act of self-care.

lifecycle of kiseau

Mother Nature doesn't want to wear your underwear for centuries.

Your order

Made in small batches

Small batch production, because that's how we reduce over consumption.

ARRIVAL

Zero plastic at your door

Plastic free, compostable packaging, FSC paper. No plastic tags. The unboxing is the proof.

Wear your skincare

Enriched with Nutrients

SeaCell™ retains 88% of its skin-loving vitamins, minerals, and amino acids even after 50 washes.

returning to earth

Degradable in active soil

Most underwear stays in landfills for centuries. We designed ours to return faster at the end of its life.

making progress

Our Materials Roadmap

  1. WHERE WE ARE

    We're 93% Natural

    Our garments are made with 93% natural fibers and 7% bio-elastane, which replaces conventional elastane with ROICA V550, tested free from PFAs, textile toxins and certified Cradle to Cradle Gold, and breaks down in microbiologically active soil instead of lingering in landfills.

  2. where we're going

    Phasing plastics out

    We are actively developing and testing plastic-free stretch alternatives, from fabric to finishes. As material science evolves, we commit to adopting the cleanest, safest options without compromising performance or comfort.

  3. our north star

    100% Natural

    To become a fully plastic-free, 100% natural, next-to-skin apparel brand designed to work with the body and return safely to the earth.

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Sizing chart

Comfort starts with your fit

Find your feel-good fit.

Choose your style, explore your measurements, and make yourself comfortable.

Body measurements

Underwear size guide

Select a size to highlight its measurements.
SizeWaist (in)Hip (in)
24" – 26"34" – 36"
26" – 29"36" – 38"
30" – 32"39" – 40"
32" – 34"41" – 43"
34" – 36"44" – 47"
37" – 39"48" – 51"

Bralette size guide

Select a size to highlight its measurements.
SizeBust (in)Band · relaxed to snug (in)US size
25" → 32"25" → 29"28A – 32B
30" → 36"28" → 33"32C – 34DD
36" → 42"34" → 40"36A – 40DD

Sizes shown are a measurement guide. Available sizes vary by style.

A little measuring goes a long way.

Use a soft measuring tape and keep it level. Measure your body, rather than a garment.

Waist

Gently bend to one side to find your natural waist. Wrap the tape around that point, level and comfortably snug.

Hip

Wrap the tape around the fullest part of your hips and bum. Keep it snug but not tight, sitting evenly around your body.

Bust

Wrap the tape around the fullest part of your bust, parallel to the floor and comfortably snug. Keep it straight across your back.

Band · relaxed to snug

Wrap the tape directly under your bust, around your rib cage. Keep it level and snug, exhaling gently as you measure.

A little heads up when it returns

Choose your size, then leave your email for a restock notification.