Flexible Nike Free technology puts biomechanic comfort and agility under every step in a training shoe that moves with you through circuits, sprints and squats.Perfect for: Multisport athletes looking for performance comfort and versatility for running, lifting, circuits and high-intensity interval training..Upper: Flywire-anchored laces provide a locked-in feel and a dynamic fit that support quick changes of speed and direction. An innovative 7/8 inner sleeve stretches, rebounds and breathes to keep your footing secure as your intensity heats up.Lower: Nike Free technology puts agility and biometric support under every sprint, squat and circuit. Internal webbing distributes weight for more stable grounding during sudden stops and quick cuts. The soft foam core provides essential cushioning, while a firmer outer layer provides durable stability. Training: provides stability, cushioning and uninhibited range of motion for multiple exercises and activities Lace-up style Flywire cables integrate with the laces for secure, flexible lockdown at the midfoot Removable, cushioned insole allows for custom orthotics Nike Free sole with flex grooves in the tread mimics natural foot movement with every stride Textile and synthetic upper and lining/rubber and synthetic sole Imported