The Salomon S/PRO SUPRA BOA 100 ski boots deliver next-level precision, foothold, and all-day comfort for all-mountain skiers. Engineered with a versatile 100 flex and a 100 mm medium last, this boot offers the perfect balance of responsive edge control and forgiving flexibility. Utilizing Salomon&';s ExoWrap shell construction paired with a micro-adjustable lower-shell BOA Fit System, it eliminates traditional pinch points by wrapping the forefoot evenly. With heat-moldable Custom Shell HD technology, riders can easily customize the shell fit to achieve precise heel hold, smoother turn initiation, and seamless energy transmission across variable terrain. Best Use: All-Mountain Ability Level: Intermediate to Advanced Flex: 100 (Medium) Last Width: 100 mm (Medium) Shell Material: Polyurethane with Custom Shell HD and SensiFIT Insert Cuff Material: Polyurethane with ExoWrap Liner: S/Pro Custom Fit (CF) Liner Power Strap: Screwed Velcro 35mm Footbed: Light 2 Footbed Closure System: 1 Screwed BOA Fit System (Lower Shell) + 2 Screwed Aluminum Buckles (Upper Cuff) BOA Fit System: A lower-shell dial, cable, and guide layout provides micro-adjustable precision across the forefoot, distributing pressure evenly to prevent hot spots. ExoWrap Construction: A specialized shell architecture designed to synergize with the BOA system, delivering a true 360-degree foot wrap for exceptional heel hold and direct ski steering. Custom Shell HD: Heat-moldable shell process allows quick personalization of the lower shell for an anatomically tailored fit that enhances control and feel. SensiFIT Insert: Soft polyurethane insert embedded into the instep section ensures easy step-in and removal without compromising weather sealing or hold. S/Pro Custom Fit Liner: Moldable foam construction provides immediate comfort, snug ankle support, and steady thermal insulation for full-day mountain comfort. Screwed Velcro 35mm Strap: Strong upper-cuff power strap adds progressive rebound and direct leg-to-ski power transfer. Riveted Cuff Alignment Pivot: Ensures standard stance customization to align the upper cuff naturally with the skier&';s lower leg.