The Salomon S/PRO SUPRA DUAL BOA 120 ski boots revolutionize micro-adjustable precision and foot hold for performance skiers. Featuring two independent BOA dials-one dedicated to the lower shell and one to the upper cuff-this boot delivers a fully customized, wrap-around fit tailored to individual leg and foot contours. Built with Salomon&';s ExoWrap construction and reinforced with a stiff Powerspine backbone, the S/PRO SUPRA DUAL BOA 120 transmits energy efficiently to ski edges while maintaining comfort and responsive control across all-mountain terrain. Best Use: All-Mountain / Performance SkiingAbility Level: Advanced to ExpertFlex: 120 (Stiff)Last Width: 100 mm (Medium)Shell Material: Polyurethane with Custom Shell HD and SensiFIT InsertCuff Material: Polyurethane with Power Spine and ExoWrapLiner: S/Pro Custom Fit Expert Liner with Custom TonguePower Strap: Screwed Energyzer Velcro 45mmFootbed: Light 2 FootbedClosure: Dual BOA Fit SystemDual BOA Fit System: Two intuitive BOA dials operate independently-one for the upper leg and one for the lower shell-providing micro-adjustable, customized wrapping that perfectly conforms to the unique contours of the foot and calf.ExoWrap Construction: An advanced shell architecture designed to work in synergy with the Dual BOA system, providing a true 360-degree foot wrap for enhanced heel retention, direct sensitivity, and seamless power transfer.Custom Shell HD: Fast, heat-moldable process enables custom fitting of the lower shell and cuff in as little as 10 minutes, adapting the boot precisely to the skier&';s foot shape.Power Spine: A sturdy rear metal backbone linking the cuff to the lower shell, delivering strong back support, progressive rebound out of turns, and maximum control on high-speed carves.SensiFIT Insert: Soft polyurethane material integrated into the instep area makes stepping into and pulling out of the boot effortless.S/Pro Custom Fit Expert Liner: High-performance, heat-formable liner with a customizable tongue that shapes to the shin for enhanced comfort and foot management.Custom Alignment & Spoiler: Includes a screwed cuff alignment pivot and an included removable 6mm rear spoiler to adjust forward lean and stance positioning.