The fabric in question is called Kelsun and it’s made using alginate, an abundant biopolymer found in seaweed — one of the most regenerative organisms on the planet.
As such, Kelsun is 100 percent biodegradable, and because it comes from the ocean, it’s free of pesticides and fertilizers.
The Outerknown Kelsun Universal Blanket Shirt represents the first commercially available product to feature Kelsun, which makes up 30 percent of the garment’s composition. The rest is Regenerative Organic Certified cotton, responsibly sourced from a textile manufacturer in Portugal.
“The Blanket Shirt was one of the first products in our line, and it remains one of my favorite pieces,” Kelly Slater says. “From the beginning, it was important to me to design and build a shirt that was high quality, made from sustainable materials, but felt vintage soft.”