Engineered to advance foothold and performance by challenging traditional boot constructions, Salomon's Supra BOA 120 outline a new standard of perfect fit. Our Exowrap Construction combined with the BOA Fit System provides a micro-adjustable, precision fit and a targeted wrap around the foot that can easily be adjusted throughout the day. Fit: Last: 100 mm - Average last intended for medium width and volume feet; can be successfully adjusted for wider feet with the Custom Shell HD heat molding process. Custom Shell HD - Salomon's proven heat molding process makes boot fitting most feet quick and easy - the latest Custom Shell HD version is even quicker to mold than before. The thinner wall construction and new shell materials allow the foot to be closer to the shell and provide enhanced sensations, more power and direction energy transmission. Flex: Flex: 120 - A stiff flex for advanced to expert skiers Liner: My Exowrap 4D Performance Liner - With Custom Tongue and Exowrap Belt Shell Materials & Design: Shell - Polyurethane with Custom Shell HD and Sensifit Mesh Cuff - Polyurethane with Custom Shell HD and Power Spine Custom Shell HD - Fully heat moldable Buckles: 2 Screwed Aluminum BOA Fit System Lower Closure - The BOA Fit System delivers micro-adjustable, precision fit engineered to perform in the toughest conditions. It also offers superior heel hold and edge-to-edge control. Quick and easy dial-up adjustment to tighten or loosen tension, plus pullout to completely loosen cable. (Note: Left boot tightens by turning the dial counterclockwise). Power Strap: Screwed Energyzer Velcro 45mm Strap Bootboard & Footbed: Light^2 Footbed - Slightly shaped, lightweight footbed made of special, lighter foams. Sole: GripWalk ISO 23223 Walk Soles