Okabashi Indigo Thong Sandals (Women's) Rubber Rubber sole Arch support and heel cup promote proper alignment of the feet and spine. Vegan-friendly, latex-free Microplast material has an antimicrobial agent that helps fight foot odor. Massaging beads on the footbed help stimulate circulation. Waterproof, machine washable materials allow for easy care. Ergonomic footbed mimics the shape of feet, so feet can spread out and move naturally.