New Balance Men's MR805 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 LockDown Liner is an adjustable, internal liner that is integrated into the lacing to provide a custom fit and securely hold the midfoot LIGHTNING DRY Ndurance outsole and tip utilizes a rubber compound for maximum durability used in high wear areas