Birkenstock Arizona Waterproof Slide Sandal (Women) 8-8.5US / 39EUB, NAVY EVA An iconic cushioned sandal is revised in a rubber-like texture with sleek adjustable straps designed to exercise foot and leg muscles while providing comfort. The contoured footbed absorbs shock and mimics the shape of a healthy foot, while pronounced medial and metatarsal arches support the instep and ball of your foot. Flat sole Adjustable straps with buckle closure Contoured footbed with arch support Waterproof Synthetic upper, lining and sole Made in Germany