New Balance Women's WR1306 Running Shoe 100% Mesh and synthetic NB ZIP is strategically located struts engineered between top and bottom plates, formulated for optimal cushioning, responsiveness and durability ACTEVA LITE is 24% lighter than standard midsole foam with Dupont Elvaloy and Dupont Engage for optimal compression set properties Ndurance is a rubber compound for maximum durability used in high wear areas BIOCOOL is a superior fabric that provides moisture management and breathability ABZORB provides a superior blend of cushioning and compression set features with Dupont Engage and Isoprene rubber for the ultimate ride