Mizuno Wave Bolt 4 Womens WH-RY Volleyball Shoe 100% Synthetic Imported Rubber sole Parallel mizuno wave construction uniformly disperses shock throughout the sole, providing lightweight cushioning and enhanced stability Extra grade rubber ("XG" rubber) allows for high traction grip to the floor Dynamation groove increases flexibility and agility while minimizing forefoot instability Non-marking outsole does not mark up the gym floor Weight: 8.1 oz