With its EVA (Ethylene-vinyl acetate) construction, the Birkenstock Women's Madrid EVA Sandals are ultralightweight, well cushioned and waterproof. Head to the beach, spa or pool in comfort and style thanks to the classic design and easily adjustable one strap design. With an original anatomically shaped footbed at the heart of every Birkenstock sandal, comfort is guaranteed. The deep heel cup cradles the heel for natural cushioning while longitudinal arch support runs along the sides for added stability with each step. In the toe area, the raised toe bar also encourages the natural gripping motion of the feet, making the sandal ideal for prolonged walking.