Speedo Women's Exsqueeze Me Zori Flop 100% Thermoplastic Polyurethane Rubber sole 100% Thermoplastic Polyurethane Hydrophobic and ultra lightweight for superior comfort around all aquatic environments Trademarked s-trac rubber outsole offers water management and dispersion to provide maximum traction and slip resistance Unique dual density injection molded eva construction for unbelievable performance and flexibility Rubber sole, Great for Pool Decks