NIKE Free 4.0 V3 Livestrong Womens Running Shoes 586296-006 Synthetic One-piece stretch mesh upper for breathability and a low-profile, streamlined fit Textured mesh full inner sleeve for a dynamic, sock-like fit that hugs the foot Diagonal cuts through the arch to encourage flexibility and help increase foot strength Minimalistic, molded sockliner mimics the foot's curvature for a great fit, enhanced comfort and ad Abrasion-resistant rubber under high-wear areas for enhanced durability