Kalso Earth Women's Cabo San Lucas 2 Thong Sandal fabric Negative Heel Technology helps correct posture by redistributing weight for light-as-air steps. Lightweight rubber outsole propels you forward with each step for a natural walking motion. BioFoam cushioning in the insole molds to the unique curves of your foot and absorbs shock. Nylon upper, EVA sockliner, BioFoam insole and thermoplastic rubber outsole. Care: Spot clean upper with a damp cloth.