Design: Single layer upper keeps things light with a contoured fit and enhanced breathability Fused between Cloud elements in the forefoot, the unique part-length Speedboard® features 15% carbon fiber for just the right amount of flexibility In-Shoe Comfort: Race-legal elite energy return from CloudTec® cushioning and Helion™ HF hyper foam Traction & Durability: Horseshoe-shaped spike plate with five removable spikes and a cross-hatched tread pattern for unmatched grip, rain or shine Additional Details: Ideal for mid-distance events Weight: 4.37 oz (124g)