birkenstock unisex gizeh metallic copper eva sandal 40 r eu birkenstock the birkenstock gizeh is our classic thong sandal. modeled on the cork original, this sandal is made from ultra lightweight and highly flexible eva. these colorful sandals are shock-absorbent, waterproof, and skin-friendly. wear them at the beach, in the garden, or in wellness and spa areas. it's the perfect addition to your classic birkenstock sandals.