Pearl iZUMi Women's isoTransition Running Shoe 100% Mesh Rubber sole 1:1 Seamless Upper creates an unparalleled fit with a seam-free interior 1:1 360 degree Lacing anatomically conforms to the foot for a tailored fit regardless of foot shape Quick lacing system for easy entry and fast transition times Drainage holes in midsole allow water and sweat to escape Blown Rubber and high durability EVA outsole combine for great cushioning and weight savings