Derived from the cork sandal, this model is made of a particularly lightweight and highly flexible EVA plastic. This premium EVA synthetic material is odorless and free of toxic substances, offering numerous advantages: it is stylish, lightweight, flexible, waterproof, and comfortable against the skin. BIRKENSTOCK anatomical footbed in EVA Upper: EVA Ins ole: Microfiber Outsole: EVA Details: Waterproof, washable, and ultra-lightweight material Made in Germany