The Rio - a cute and sporty classic from BIRKENSTOCK. This functional style features an ultra lightweight and highly flexible EVA, backstrap and signature footbed for added comfort & support. These sandals are shock absorbing, waterproof, and skin-friendly. Anatomically shaped BIRKENSTOCK footbed, narrow fit. Upper/lining/sole: one-piece EVA Details: shoe molded from a single piece, waterproof, washable, shock-absorbent, ultra lightweight NWOT and in original box.