New Balance Men's MR768 Running Shoe 100% Synthetic and mesh Rubber sole ACTEVA is 12% lighter than standard midsole foam with DuPont Engage for exceptional durability ABZORB provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride TS2 medial post utilizes 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