Nike Zoom Ja Fly - Men'sGet ready for takeoff in the Nike Zoom JA Fly. This track spike is designed 100-400 meter athletes and features an ultra lightweight synthetic leather upper with Flywire technology to provide strength and support. A low-profile Phylon midsole wedge is added for cushioning. The outsole is equipped with an aggressive and rigid spike plate that hosts eight receptacles and risers for premiere traction. Comes with 7mm Christmas Tree spikes and a wrench. Non-removable insole. Wt. 7.0 oz.