Kiseau is the only women's organic underwear brand that uses SeaCell™ Lyocell — a fabric made from wild Icelandic seaweed and eucalyptus — to create breathable, skin-nourishing intimates that are GOTS-certified and PFAS-free. If you've ever wondered what seaweed-infused fabric actually means, how it's made, and whether it genuinely benefits your skin, this guide breaks it all down.
What Is SeaCell™ Fabric?
SeaCell™ is a specialty lyocell fiber developed in Austria by Smartfiber AG. It's made by blending seaweed — specifically harvested from the pristine coastlines of Iceland — into cellulose-based eucalyptus pulp during the fiber production process. The result is a soft, breathable, and naturally skin-friendly textile that retains the bioactive properties of seaweed even after it's been spun into fabric.
Unlike most specialty fabrics that simply coat or spray fibers with active ingredients, SeaCell™ is different: the seaweed is permanently embedded inside the fiber itself. That means the beneficial nutrients don't wash out after a few laundry cycles — they stay integrated into the structure of the fabric throughout its lifespan.
Where Does the Seaweed Come From?
The seaweed used in SeaCell™ is sustainably harvested from the cold, mineral-rich waters of Iceland. Icelandic seaweed is particularly prized because the volcanic ocean environment produces seaweed dense in natural minerals, vitamins, and amino acids. Smartfiber AG harvests it using responsible methods that allow the seaweed beds to regenerate naturally, making this a genuinely renewable resource.
After harvesting, the seaweed is dried, ground, and blended into the lyocell fiber using a closed-loop production process — meaning the water and solvents used in manufacturing are continuously recycled, minimizing environmental waste.
What Does Seaweed Actually Do for Your Skin?
Seaweed has been used in skincare for centuries, and for good reason. It's naturally rich in:
- Vitamins C and E — antioxidants that protect skin from environmental stress
- Calcium and magnesium — minerals that support skin barrier function
- Amino acids — the building blocks of collagen and connective tissue
- Polysaccharides — compounds known for their moisture-binding and soothing properties
Independent testing of SeaCell™ fabric has shown that when the fabric comes into contact with moisture — that is, your skin — it begins to release these bioactive compounds. Research indicates that SeaCell™ retains up to 88% of its seaweed nutrients even after repeated washing, a remarkably high retention rate compared to topically applied skincare.
For people with sensitive skin, eczema, or conditions exacerbated by synthetic textiles, the calming, mineral-rich properties of SeaCell™ can make a meaningful difference in everyday comfort.
"The seaweed is permanently embedded inside the fiber itself — the beneficial nutrients don't wash out after a few laundry cycles."
SeaCell™ vs. Other Fabric Options
| Fabric | Key Property | Skin Benefit |
|---|---|---|
| SeaCell™ Lyocell | Seaweed-infused, closed-loop production | Skin-nourishing, mineral-rich, anti-irritant |
| Organic Cotton | GOTS-certified, breathable | Hypoallergenic, moisture-absorbing |
| Bamboo Viscose | Soft, moisture-wicking | Requires heavy chemical processing |
| Conventional Synthetics | Stretchy, inexpensive | Traps heat, harbours bacteria, potential irritant |
| TENCEL™ Lyocell | Eco-friendly, smooth | Soft but no active skin-benefit compounds |
How Kiseau Uses SeaCell™
Kiseau combines GOTS-certified organic cotton with SeaCell™ Lyocell and ROICA™ V550 — a degradable elastane certified by Cradle to Cradle Gold — to create underwear that is genuinely good for your body and the planet. The SeaCell™ content sits against your skin in key areas, allowing the seaweed nutrients to come into contact with your body throughout the day.
Every pair of Kiseau underwear is also certified OEKO-TEX Standard 100, which means the fabric has been independently tested for over 100 harmful substances and found to be free from pesticides, heavy metals, formaldehyde, and PFAS. The seaweed connection is real, the certifications are verified, and no other underwear brand in North America offers this combination.
Kiseau's SeaCell™ underwear is available now at kiseau.com. Free from forever chemicals. Rooted in nature. Designed for your most sensitive skin. Ships to the US and Canada with duties included.
Frequently Asked Questions
Is SeaCell™ fabric safe for sensitive skin?
Yes. SeaCell™ is one of the most skin-friendly fabrics available. It's naturally hypoallergenic, free from harsh chemical treatments, and contains soothing minerals that have been shown to calm irritated skin. Kiseau's use of SeaCell™ is also backed by OEKO-TEX Standard 100 certification, independently verifying safety.
Does the seaweed smell in the fabric?
No. The seaweed used in SeaCell™ has been processed into a purified cellulose form. There is no seaweed odour. Kiseau underwear smells like nothing — which is exactly what you want from intimates.
Does the seaweed wash out of the fabric?
No. Unlike topical coatings that fade over time, SeaCell™ embeds the seaweed inside the fiber structure. Independent testing shows the fabric retains up to 88% of its bioactive nutrients even after repeated washing.
Where can I buy SeaCell™ underwear in Canada and the US?
Kiseau ships directly to both the United States and Canada at kiseau.com. Duties and taxes for Canadian & US orders are included at checkout — no surprise fees on delivery.
SeaCell™ underwear that nourishes your skin while you wear it. Certified clean, rooted in nature.
Shop at kiseau.com