Product DetailsSay hello to an entirely new and totally comfortable natural running experience in the 33-FA™ shoe. ComforDry™ Lasting and a ComforDry™ Sockliner double up for unsurpassed underfoot comfort while Seamless Construction and the oblique-shaped Natural33™ last create a truly slipper-like fit and feel.New forefoot flex groove geometry and FluidAxis® Technology complement the ultra soft AmpliFoam™ platform for smooth flexibility from heel to toe. Weight: 9.2 oz. Heel Height: 20mm. Forefoot Height: 16mm.