New Balance Women's WT811 Running 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 ABZORB provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride C-CAP is a compression-molded EVA for superior midsole cushioning and flexibility internal shank Ndurance outsole utilizes a rubber compound for maximum durability used in high wear areas