The Nike Free 4.0 running shoe features a modified innersleeve construction made of sandwich mesh that provides a dynamic, sock-like fit that hugs the foot, but still allows for easy on and off. Seamless upper with engineered laser-perforated design covers the stretchy mesh innersleeve to provide a supportive, skin-like fit that moves with each stride. Tongue-wrap construction offers comfort and easy on and off. Asymmetrical lacing system is offset to the lateral side of the foot to help reduce pressure over the top ridge of the foot for enhanced comfort. Large, reflective Swoosh design trademark remains visible in low-light conditions. Low-profile, Phylite™ midsole provides a resilient ride and is tough enough to double as an outsole, dramatically reducing the overall weight. Sipes along the length and width of the midsole enhance flexibility and help maintain stability. Transtarsal diagonal cuts through the arch enhance natural motion flexibility and help increase foot strength. Minimalistic, molded sockliner mimics the curvature of the foot to provide a great fit, enhance comfort and add support. Strategically placed BRS 1000™ carbon rubber enhances durability. Pods of solid rubber on the medial toe for durability and traction. Waffle® outsole enhances traction and durability while also encouraging a more neutral and efficient toe-off. Wt. 7.9 oz.
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