Always wanted to take your Birkenstock for a swim? Now you can! These Arizona two-strap sandals are made of 100% EVA meaning they are lightweight, flexible and shock-absorbing. Features 100% EVA synthetic Shock-absorbing Anatomically correct footbed Water, oil and grease resistant Please avoid leaving these in direct sunlight or extreme heat as EVA can shrink. Please note that Birkenstock EVA sandals are not designed as an everyday street shoe. They are perfect for around the pool, at the beach or on the boat, though they are not designed for regular use on concrete or pavement and this will impact their longevity.