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 Fitting & Care Notes: The Arizona in EVA is a waterproof option that offers great comfort and contouring but is not intended to replace your traditional Birkenstocks. 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. In sizes 35-40, the Arizona EVA is only available in a narrow width, however most people with regular width feet are able to wear narrow in this style as it is more flexible than the traditional footbed. The regular width is available in larger sizes. These sandals can rub a little to begin with but will quickly soften up and become very comfortable. Please avoid leaving these in direct sunlight or extreme heat as EVA can shrink.