New without box Birkenstock kids Rio EVA navy blue sandals. Size 11.5 (European size 29). The Rio is 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. Wear them at the beach, in the backyard, or by the pool. New to Poshmark? Use code Sbalen when signing up for $10 off!