Breathable Knit Flats, Made From Natural Materials for All-Day Wear. Made From Nature Our proprietary knit feels lightweight, breathable, and pleasantly cool thanks to a tree fiber material blend Barefoot Feel Our minimalist flat feels like a bare foot and has enough support to stay on your feet all day, thanks to the comfort of SweetFoam®, our cushioned sole made from sugarcane. Easy to Clean Our shoes are machine washable—just remove the insoles and hand wash them separately—to keep every step as fresh as the first. They are in great shape with only minimal wear on the bottoms. These are in great shape! The shoe and insole look almost new, only minimal wear on bottoms, see photos. Perfect for spring and summer!