For discus, shot and hammer throws the Cyber throw with Slip Lasting-For lightweight and flexibility. Upper is wrapped and stitched before it is glued to the midsole. High Abrasion Leather Upper-Upper materials are made of an abrasion and tear resistant synthetic leather which increases upper durability. Dual Density Rubber Outsole-Sole contains a durable circular point of rubber which gives the best grip during rotation while the softer part provides grip. Receive a free set of spare spikes when you purchase these spike shoes. Simply state on your order form what length you require.