New Balance Women's WR904 Running Shoe 100% Synthetic and mesh ABZORB DTS provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride ACTEVA ULTRA LITE is 32% lighter than standard mid-sole foam with optimal compression set made with DuPont Elvaloy TS2 post utilizes a transitional support system with multi-density medial support which creates a smooth transition from heel strike to toe-off NLOCK is an integrated lacing and webbing system that provides optimal fit, support and security