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. If you have a low instep and prefer a snug fit, we suggest a half size down. If you have a medium or high instep, order your normal size. Ultra breathable Stitchlite knit upper. Luxe cushioning in the outsole, footbed, and sockliner. Springy arched outsole absorbs shock. Smart materials mimic the foot’s natural flexibility.