The double strap sandal slippers are made of lightweight high quality EVA material. Non slip, prevent from slipping. The sole not only provides good shock absorption but are soft, light weight, comfortable, and easy to clean. 100% EVA: Ethylene Vinyl Acetate material that is durable, slip resistant, waterproof, washable, lightweight, softness, abrasion resistance, aging resistance and odorless, non-toxic.