Alpine ski boots all mountain ski boots suitable for men season 2017 skill levels expert advanced last 100106 mm widths average wide flex index 100 flex medium special features with canting thermoformable shell removable toe and heel pads adjustable flex lining features thermoformable boot liner outer material polyurethane colour black fasteners buckle fastener velcro buckle 4 x micro adjustable aluminium buckles shoe technologies custom shell 36