adidas Performance Adizero Javelin Running Shoe 100% Synthetic Synthetic sole Heel measures approximately 1.25" Weight: 11.5 ounces (size 9); Recommended events: javelin Internally reinforced synthetic cage upper for secure hold during throwing motion; Carbon rubber toe cap for protection and durability during toe-off Soft collar around the ankle to reduce pressure on the ankle and Achilles; Hook-and-loop strap for additional support during throwing motion Microsuede lining provides maximum comfort while increasing durability in high-tension areas PRO-MODERATOR medial support designed to stabilize the foot during the landing and throw phase of javelin; Sharkskin outsole for uncompromising grip and reduced weight, allowing for a more aggressive approach into the throw