Pearl iZUMi Women's isoShift Running Shoe 100% Mesh Rubber sole 1:1 Graduated Guidance System guides the foot from heel strike to toe-off for a smooth, consistent feel 1:1 360 degree Lacing anatomically conforms to the foot for a tailored fit regardless of foot shape 1:1 Seamless Race Upper creates an unparalleled fit with a seam-free interior 1:1 Energy Cell cushions the forefoot upon impact and then returns energy back to the runner as it compresses and rebounds on contact Ortholite sockliner for amazing step-in comfort and long-lasting cushioning