New Balance Men's MR740 Running Shoe 100% Synthetic and mesh Rubber sole ACTEVA is 12% lighter than standard midsole foam with DuPont Engage for exceptional durability Stability Web provides optimal arch support thats both rigid and lightweight while preventing midfoot flex ABZORB forefoot provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride