The Lupo Ax HD with PU-Polyamide shell is totally built to last. A 40 mm wide Power Strap together with a long fiber Carbon cuff delivers fantastic power transfer. The Lupo Air HD liner provides very light weight and perfect fit. The super comfortable 100 mm last lets you wear the Ax HD all day long without fatigue. Especially for skiers on day-long tours or piste personel this is a real benefit.