ASICS Hyper Sprint 4 Running Spikes Nylon Spike Plate - Increased durability and traction on all surface. Solid Rubber Outsole - Provides enhanced durability and traction. Combination Lasting - For stability and flexibility. Board lasting in the heel and slip lasting in the forefoot. Synthetic leather and mesh upper - for good flexibility and breathability EVA Heel Pad - For good cushioning around heel area for greater shock absorption.