Amazon.com | Unisex Nike JA Fly 4 (102 - White/Black-Bright 。New without tag/box. Nike Ja Fly 4 Track and Field Sprinting Spikes. Designed for performance in track and field, racing, and running. These athletic shoes feature a lace-up closure, rubber outsole, and breathable synthetic upper material for comfort and support. The lightest Nike Sprint spike sports a revamped plate for enhanced stiffness and an updated upper for better breathability, so you can stay focused on doing your best. Lighter, Faster. An updated woven upper gives you security and containment at a significantly lighter weight than the Ja Fly 3, but with more breathability. Explode Out of the Blocks. A completely new plate using computationally designed hexagons delivers stiffness in key areas to help you fly off the starting line and maintain speed throughout the race. Does not come with spikes. Excellent clean new condition.