3 Force technology maximizes the transmission of energy from the leg and foot to the liner and shell; 3 Force Honeycomb construction pairs a light yet stiff frame that's especially responsive with a cuff and shell composed of a softer plastic; Infrared Technology releases pressure from sensitive areas and bunions; Not suitable for traditional alpine bindings; Gripwalk Soles provide a rocker sole interface for effortless walking and compatibility with Marker Gripwalk bindings and similar