The Birkenstock Arizona EVA in men's sizes come in the style of classic Birkenstock sandals with an anatomically shaped footbed, adjustable straps and a non-slip outsole. However, this model is made of ethylene vinyl acetate copolymer or EVA, from the straps to the footbed to the soles. In other words, a high-quality, light, elastic plastic with good cushioning properties. And one that is waterproof and washable.