New Balance Women's WR905 NBX Running Shoe 100% Synthetic and mesh Rubber sole ABZORB provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride ACTEVA LITE is 24% lighter than standard midsole foam with Dupont Elvaloy and Dupont Engage for optimal compression set properties TS2 is a transitional support system with multi-density medial support which creates a smooth transition from heel strike to toe-off 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