Pearl iZumi Women's isoSEEK IV Running Shoe 100% Mesh Rubber sole 360 degree reflectivity 1:1 Gruaduated Guidance System guides the foot from heel strike to toe off for a smooth, consistent feel 1:1 Energy Cell cushions the foot upon impact and then returns energy as it comprsses and rebounds on contact SKYDEX heel crash pads 1:1 Lacing anatomically conforms to the foot for a tailored fit reguardless of foot shape