adidas Men's sprintstar Track Shoe 100% Man Made Imported Synthetic sole Weight: 6.1 ounces (size 9); Recommended events: 60m, 100m, 200m, 400m, 4x100m, 4x400m Reinforced mesh upper for maximum heat exchange; SPRINTWEB forefoot designed to lock the foot down during event-specific motions Synthetic overlays designed to hold the foot securely during all phases of the sprinting gait Soft collar around the ankle to reduce pressure on the ankle and Achilles Designed for efficient power and technical sprinters