Built for the fastest athletes, the powerful and aggressive New Balance Vazee Sigma Sprint Spike features the Boa® closure system with a midfoot canopy that offers a truly customized fit. The asymmetrical 8-pin spike plate offers rigidity and flexibility for maximum performance in short distance sprints. Tech Specs & Features:Ideal for short distance racing: 50 - 400 meters.Skeletally-engineered FantomFit upper that provides ultra-light support and fit.Sock-like collar construction.Boa® closure system utilizes the perfect fit with a simple knob turn, by wrapping around the midfoot and heel wrap.Asymmetric 8-spike configurationRL-2 last