The Endorphin LD4 is Saucony's lightest spike ever, and the lightest spike on the market today. This elite-level distance spike is designed for a range of events, from the 1,500m to the 10,000m, and when every second counts, runners can depend on the Endorphin for its super-light, but performance-engineered upper and spike plate. Weights just 2.4 oz (W8). Fit: True to Size