Pearl iZUMi Women's Iso Shift Stability Shoe 100% Mesh and synthetic Rubber sole Seamless Race Upper creates an unparalleled fit with a seam free interior 360 degree Lacing anatomically conforms to the foot for a tailored fit regardless of foot shape Graduated Guidance System guides the foot from heel strike to toe off for a smooth, consistent feel Energy Cell cushions the foot upon impact and then returns energy as it compresses and rebounds on contact Skydex heel crash pad