Racing ski boots suitable for men season 2016 skill level advanced last 98104 mm widths narrow average wide flex index 100 flex medium special features adjustable foot width thermoformable shell ski walk mechanism lining features thermoformable boot liner outer material polyurethane colour red fasteners buckle fastener velcro buckle 4 x micro adjustable aluminium buckles strap 35mm velcro strap shoe technologies twinframe custom shell 360 li