New Balance Women's WCT1200 Tennis Shoe 100% Synthetic and mesh ABZORB EX is a combination of New Balance's premium ABZORB foam and a peripheral pocket of non-pressurized air that is encapsulated in an engineered thermoplastic ACTEVA is 12% lighter than standard midsole foam with DuPont Engage for exceptional durability ABZORB SBS is an engineered, non-cellular elastomer designed to provide optimal shock absorption and no compression set Midsole medial post Ndurance outsole utilizes a rubber compound for maximum durability used in high wear areas