The adidas Sprint Star 4 track spike is recommended events 60M, 100M, 200M, 400M 4 x 100M, and 4 x 400M events. SPRINTWEB forefoot design locks down the forefoot during powerful toe off. Synthetic overlays are designed to hold the foot firmly during all phases of the sprinting gait. Soft collar around the ankle helps reduce pressure on the ankle and Achilles. EVA midsole. Arkema Pebax® nylon plate gives maximum energy return. Includes 1/4" pyramid spikes and a wrench. Wt. 5.3 oz.