Wear seaweed, not synthetics. Your cooch will thank you.

Organic Slim Fit Thong | Set of 7

$182.00 $155.00

Quantity: Set of 7

Style: Thong

Size
Color

⛟ Free Shipping on orders over $95 within the US

Your first pair of Kiseau underwear is risk-free, because we know switching to healthier undies is a big step.

How it works

  • Wear it, wash it, live in it.
  • If your first pair doesn’t feel good, let us know within 30 days.
  • You’ll receive a full store credit so you may get a pair that fits best in a different size or style of your choice.

Read full refund policy here

  • Mid-rise fit designed for everyday comfort
  • Naturally breathable and anti-odor
  • Free of elastic bands and tags
  • No pinching, digging, or cutting into skin
  • GOTS & OEKO-TEX® Standard 100 certified fabrics & dyes
  • Free of PFAs, toxic plastics, azo dyes, heavy metals, bleaches and harmful textile toxins
  • Designed in North America. Made in Sri Lanka

Fabric Composition

GOTS Certified Organic Cotton

70%

SeaCell™ (Icelandic Seaweed & Eucalyptus Lyocell)

23%

ROICA™V550 clean stretch

7%

Visit our materials page to learn more.

Nutrients in SeaCell

  • Vitamin E

    Helps protect from environmental stress.

  • Magnesium

    Contributes to skin vitality

  • Calcium

    Soothes and calms the skin

  • Iodine

    Antibacterial & promotes hydration

  • Amino Acids

    Supports skin hydration & elasticity

  • Antioxidants

    Help neutralize free radicals

  • Retinol

    Known for skin renewing properties

Our packaging is plastic-free. We give you the option of receiving your undies in zero-waste recyclable kraft paper mailers or biodegradable poly mailers.

  • Recommended: Machine wash on a gentle cycle, or handwash using natural detergent inside a delicate wash bag.
  • Avoid: Bleach and fabric softeners. They break down natural fibers and shorten the life of your undies.
  • Drying: Tumble dry on low, or better yet, lay flat or hang to air dry for maximum longevity.
  • Storage: Keep your undies in a cool, dry place. In humid environments, a dry storage bin with a bit of baking soda helps keep things fresh.

Note: Save your undies from conventional detergents that contain harsh chemicals like phthalates and formaldehyde that harm your health, the earth, and wear out your undies.

Seven pairs of Kiseau Organic Cotton Thong Underwear, sustainable, lightweight, and ethically made in small batches.

Organic Slim Fit Thong | Set of 7

$182.00 $155.00
$182.00 $155.00

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Your cooch called. She wants to breathe.

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Certified clean fabric & dyes

Free of PFA's, Azo's & toxins

Irritation-free design

Vitamins, anti-oxidants, & amino acids

Naturally Breathable

Anti-bacterial & anti-odor

What women are saying

Customer Lucy holding Kiseau Organic Cotton & Icelandic Seaweed underwear boxes on balcony by the lake, sustainable and eco-friendly product.
Customer Lucy enjoying morning coffee on balcony surrounded by palm trees, wearing relaxed natural clothing, representing Kiseau’s sustainable lifestyle

Lucy

Verified Customer

I'm so happy I've introduced Kiseau natural thongs into my underwear rotation. I love that they don't use any toxic fabrics. They're soft and supportive in all the right places.

Five pairs of Kiseau Organic Cotton Thong Underwear in natural hue, breathable and toxin-free minimalist essentials.

Organic Slim Fit Thong | Set of 5

$130.00 $115.00
Customer Ann holding two Kiseau Organic Cotton & Icelandic Seaweed underwear boxes, sustainable and breathable small-batch packaging design
Customer Ann enjoying a sunny day near a fountain, wearing relaxed natural clothing, representing Kiseau’s sustainable lifestyle values.

Ann

Verified Customer

Been struggling to find natural undies without elastic bands that dig into my skin. These undies are silky soft and they hug me in all the right places without hurting me.

Woman modeling Kiseau organic cotton bikini underwear, breathable and eco-friendly, back view.

Organic Everyday Bikini

$26.00

Customer Reka holding Kiseau Organic Cotton & Icelandic Seaweed underwear packaging, smiling indoors, sustainable and toxin-free design.
Customer Reka smiling in portrait shot, sharing her experience with Kiseau’s natural organic cotton underwear.

Reka

Verified Customer

I noticed after switching to your underwear that my skin irritation has literally started to slowly heal after years of trying to find something that would help me.

Back view of woman wearing Kiseau organic cotton thong underwear, sustainable breathable fabric, soft natural fit.

Organic Slim Fit Thong

$26.00

LOVE AT FIRST PAIR.

Feel the difference from the very first wear.

See our Comfort-First Guarantee

Infographic showing Kiseau organic cotton thong underwear features, including mid-rise fit, breathable body and gusset, high-quality seams, and elastic-free comfort.
Two women wearing Kiseau organic cotton underwear, close-up torso view, sustainable breathable fabric, natural tones.

5 Reasons You'll Love Kiseau Underwear

Curated with a blend of organic cotton, wild Icelandic seaweed, eucalyptus & non-toxic stretch (GOTS & OEKO-TEX Certfied)

Infused with sea-kissed seaweed nutrients like vitamins, antioxidants and minerals that soothes your intimates.

Light, breathable fabric that keeps your intimates cool without trapping heat and moisture.

Elastic-Free freedom without digging, pinching or tight marks.

Free of icky toxins, PFA's, pesticides, harmful dyes & finishes that mess with your hormones.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Underwear that puts your health first.

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Certified by Globally Recognized Standards

Clean fabrics from fiber to undies

Global Organic Textile Standard (GOTS) logo with green circle and white arrows on a white background
OEKO-TEX Standard 100 logo on a white background
FSC certification logo on a white background
Cradle to Cradle certification logo with gold level on a white background

Organic Cotton

GOTS Certified

Verified Non-GMO seeds, grown without synthetic pesticides, herbicides, or fertilizers and meets strict environmental standards.

SeaCell™ Lyocell & Dyes

OEKO-TEX STANDARD 100

From fiber to finish, all materials are tested for harmful chemicals and certified safe for human health.

SeaCell™ Lyocell

FSC Certification

Ensures sourcing is from responsibly managed forests where biodiversity is maintained and materials are traceable.

ROICA™ V550

The Cradle to Cradle Certified™ Material Health Gold Level

Ensures safety, non-toxicity, and environmental responsibility, meeting one of the highest standards in sustainable textiles.

Learn more

Kiseau vs. Other Undies

Kiseau Undies
Nylon/Spandex Undies
Generic Bamboo Undies
Generic Cotton Undies
Generic Organic Cotton Undies
Breathable
Toxic-free
Sustainable
Biodegradable
No Elastic Band
Zero Forever Chemicals
Azo Dyes Free

Our Mission Is Powerfully Simple

Free Your Body of Toxins

We deserve better than to live with harmful chemicals and microplastics, and so does the Earth.

Antithesis To Fast Fashion

We’re creating in small batches with earth-friendly fabrics that return to the earth, not landfills or our waters.

Clean Supply Chain

We work with suppliers who value human health, sustainability, ethical labor practices, certified processes, and regenerative, organic farming.

Towards a Natural Future

We reimagine everyday essentials with natural, toxin-free fabrics. Creating new standards you can live in, without compromise.

Returning to the earth

When your undies reach the end of their life, they break down into water and CO₂, leaving no trace behind. Unlike undies with conventional synthetics that last in landfills for centuries.

Plastic-Free Packaging

Every year, 180 billion poly bags are tossed into landfills after single-use. We’re flipping the script by using plastic-free packaging.

Homegrown Talent

Our founder supports skilled artisans from her home country in Sri Lanka by working with a small-scale ethical studio that empower skilled-worker communities.