All mountain ski boots alpine ski boots suitable for men season 2017 skill level advanced last 100 mm width average flex index 90 flex medium special features removable toe and heel pads adjustable flex with canting lining features thermoformable boot liner outer material polyurethane colour black fasteners buckle fastener velcro buckle 4 x micro adjustable aluminium buckles strap 35mm velcro strap shoe technology twinframe liner my custom fit