Redesigned with a new seamless toe box construction in the UltraFit2 liner Tecnica's Diablo Flame with customizable UltraFit2 Ski Boot offers the stiffness most advanced skiers require without jamming your foot into the vice-like grip of other ultra-rigid top-end racing and extreme backcountry boots. If you tend to hit all the spaces marked with black diamonds but you prefer to maximize your time on the mountain this boot is a practical choice. All Tecnica Diablo ski boots have a triple-density construction that places the most rigid material around the heel toe and toe box and the softest flexible components around the top of the insteps. You can adjust this fit and flex on the Diablo Flame with the two-position Flex Adjustment switch and the custom-aligning Dual Pivot device. There's also a Twin Support System with extended upper flaps that help distribute lateral pressure creating a closer closure around your shin for a responsive performance. The redesigned UltraFit2 liner offers more customization features than Tecnica's ComfortFit and SuperFit liners and features thermoformable pre-molded EVA with a new seamless neoprene toe box.