The Nike Lunar TR1 training shoe features an ultra-light Flywire upper that hugs the entire length of the foot with an adaptive, supportive fit. Foam in the collar enhances heel lockdown, along with an inner sleeve the conforms to the foot. A LunarIon midsole gives a soft, yet responsive ride. The Lunar TR1 uses a rubber outsole for multi-surface traction with natural-motion-engineered flex grooves to promote a stable platform when moving in all directions. Wt. 12.2 oz.