Features: High-quality Material: Made from natural elastic rubber sponge, which has high densityand high ductility, its not easy to fall off. Skid Resistance: The material is flexible and will not become slippery when meeting with water. Instead, it will produce greater friction, moisture absorption, quick drying etc. It will have more skid resistance when you sweat. Shockproof: It can effectively slow down the shock from the road surface with tail plug. Multiple Options: It has different colors for you to choose. You can choose the style as desired.