New Balance Women's RT801 NBX Running Shoe 100% Synthetic and mesh Rubber sole ABZORB provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride ACTEVA LITE is 24% lighter than standard midsole foam with Dupont Elvaloy and Dupont Engage for optimal compression set properties Medial post LIGHTNING DRY lining Ndurance is a rubber compound for maximum durability used in high wear areas