We’ve refined the ZEROGRAND silhouette and pushed our materials beyond their limits to create the lightest ZEROGRAND style ever made. With an innovative lacing system that locks laces into place, the shoe actually becomes an effortless slip-on style. Proprietary Stitchlite knit upper for comfort and breathability Lined in fabric. Fully padded sock lining for ultimate comfort. Lightweight compression molded outsole provides cushioning and comfort. Flex grooves for added flexibility.