New Balance Women's WR737 Running Shoe 100% Mesh and synthetic ACTEVA LITE is 24% lighter than standard midsole foam with Dupont Elvaloy and Dupont Engage for optimal compression set properties Ndurance is a rubber compound for maximum durability used in high wear areas ABZORB provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride Stability Web provides optimal arch support thats both rigid and lightweight while preventing midfoot flex NLOCK is an integrated lacing and webbing system that provides optimal fit, support and security