OLUKAI Men's Eleu Trainer Rubber Imported Rubber sole FEATURES: Quick-lace system for easy on/off, molded toe and heel overlays, and a gusseted tongue for protection against outdoor elements. UPPER: Combination of quick-drying open mesh for breathability and drainage, ballistic nylon for durability and a synthetic exoskeleton for support and structure. A cord lacing system with toggle and lace fastener for a secure fit. FOOTBED: Dual-density anatomical EVA footbed provides excellent support and cushion. Hydrophobic and perforated to save weight and shed water. Removable and washable. OUTSOLE: Seated on a compression molded EVA midsole and a sticky rubber outsole for maximum traction on wet surfaces, the rounded traction pattern, and forefoot flex grooves allows for a natural foot strike and increased agility.