The Alpina SP 45 Combi Boot is made for people who like to train and ski in comfort. Alpina gave it a wide fit through the ball of the foot for comfort and a snug heel to prevent blisters. The plastic hinged cuff makes the boot laterally stiff, so you'll be more confident in your stride and transfer more power to your skis. The anatomically shaped footbed holds your foot in a neutral position to maximize your efficiency and comfort. A favorite of high school racers, the SP 45 is a solidly performing boot that comes at a much lower cost than the World Cup models. The Alpina SP 45 Combi Boot is compatible with both NNN classic and skate bindings.