The Nike FREE Run+ 2 EXT blends the strength and injury prevention benefits of barefoot running with the comfort and protection of a casual shoe for the best of both worlds. The multi-layer upper is constructed from breathable mesh for a lightweight, second-skin fit. The full inner-sleeve adds comfort while the deep Nike Free sipes enhance flexibility for a barefoot-like ride. The outsole uses environmentally preferred rubber for added durability while the WaffleŽ piston enhances cushioning and response. Wt. 7.6 oz.