Sperry Top-Sider Men's Coastal Runner 2 Strap, Taupe, 9 M US 100% Synthetic Rubber sole Patent Pending technology for under heel anti-shock and vibration properties Quick-drying materials for low water absorption Internal drainage to remove water around the foot Hydro-Grip rubber traction compound Non-marking outsole with Quadro-Grip Multi-Directional Wave-Siping for ultimate wet/dry traction