Founded by pro surfer Kelly Slater, Outerknown is known for making high-quality, sustainable, and ultra-wearable pieces, and this Blanket Shirt is a fan-favorite of the brand. The cozy staple is made from 100% organic cotton twill, which means its creation required none of the toxic synthetic chemicals required to grow conventional cotton, and the shirt’s buttons, made from tagua palm nuts gathered from the forest floor, are biodegradable. It comes in a number of colors and patterns and is available in both mens and womens sizes.