Women's Arizona EVA (Elemental Blue)The legendary two strap design from BIRKENSTOCK the Arizona. Modeled on the cork original, this sandal is made from ultra lightweight and highly flexible EVA. These sandals are shock absorbing, waterproof, and skin friendly. Wear them at the beach, in the garden, or around the gym and after workouts. It's the perfect addition to your classic BIRKENSTOCK sandals. Upper: EVA EVA (ethylene vinyl acetate) is a high quality, very light, elastic material