adidas Women's Sprintstar W Women's Running Shoes with Spikes 100% Synthetic Imported Synthetic sole Weight: 4.7 ounces (size 7); Designed for efficient power and technical sprinters SPRINTWEB forefoot designed to lock the foot down during event-specific motions Reinforced mesh upper for maximum heat exchange with outside elements Synthetic overlays to hold foot securely Soft collar around the ankle to reduce pressure on the ankle and Achilles during sprinting; Pebax plate for ultimate energy return and durability