An iconic BIRKENSTOCK model, the Birki Flow can be worn in any season. Large openings at the front of the foot ensure a consistently cool climate inside the shoe. 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 Insole: Microfiber Outsole: EVA Details: Waterproof, washable, and ultra-lightweight material Made in Germany