The Nike Lunar TR1 training shoe features an evolved Flywire upper that hugs the entire length of the foot with customizable, lightweight support. Heel clip engages upon footstrike to provide snug fit and support. Encapsulated Zoom Air™ offers first-step responsiveness. Natural-motion-engineered flex grooves promote a stable platform. Herringbone Waffle® pattern outsole provides multi-surface traction. Wt. 12.0 oz.