Rio is the classic quarter strap sandal with two points of adjustment across the top of the foot and around the ankle. The Classic Footbed Rio offers a secure and comfortable fit for walking all day about town. The Rio EVA is exclusively designed for wet areas and not an everyday shoe. A waterproof alternative to the Classic Birkenstock Rio for kids. Great for the beach or beside the pool. This style must not be left in direct sunlight and are not designed to be worn day in day out, for long periods of time or on lengthy walks. This product is vegan.