All mountain ski boots freeride ski boots suitable for men season 2017 skill levels advanced expert last 100 mm width average flex index 100 flex medium special features with canting high thermal insulation walk to ride wtr compatible ski walk mechanism anti slip sole outer material polyurethane colour black fasteners buckle fastener velcro buckle 4 x micro adjustable aluminium buckles strap 50mm velcro strap inner material thinsulate liner t