The Atomic Redster TR F4 is built for powerful racers who want World Cup-level performance without the unyielding stiffness of a 150-flex boot. With a strong 130 flex and robust, supple shell construction, it's designed to handle bigger athletes who still need a responsive, race-tuned feel. Constructed with Atomic’s premium Formula Plastics for consistent flex across temperatures, the TR F4 maintains a precise 93mm Racing Last and an anatomical toe box for optimal foot positioning and control. The World Cup Race Liner delivers top-tier fit and feedback, while the Ankle Retention System and adjustable Redster AFS Tongue provide a locked-in feel and customizable fit. Underfoot, the Power Chassis adds extra torsional stiffness, and the Redster Solid Sole ensures seamless power transfer with alpine race bindings. This boot blends muscle with finesse for serious athletes chasing podiums.