Alpine ski boots racing ski boots suitable for men season 2015 skill level advanced last 100 mm width average flex index 100 flex hard special feature with canting lining features anatomically mouldable boot liner canting double canting outer material polyurethane colour white fasteners buckle fastener velcro buckle 4 x micro adjustable aluminium buckles strap 50mm velcro strap shoe technology sensor liner foam fit series rossignol hero