the atomic redster sti 110 with the slim race shell is our most flexible race boot for adult skiers - easy to flex with plenty of stability.key features slim race shell power control 93mm narrow lastredster sti 110redster sti 110ae5020760for lightweight skiers seeking a low-volume race boot, there's no better match than the atomic redster sti 110. the slim race shell offers plenty of flex while providing top-notch stability, and it has the same world cup liner as the stiffer options in the line-up. the narrow fit 93mm last makes this boot the perfect choice for skiers with low-volume feet, letting them lock-in the boot feel and ski with unlimited confidence. for the lightest-weight racers that still want to rip, this boot will hopefully make their podium dreams come true. fit narrowjuniormediumwide flex hardmediumsoft weight1873 g / 24xtech features slim race shell power control 93mm narrow last memory fit regular cuff low cuff world cup liner 35mm velcro strap 7000-series alu buckle 16°-18° forward lean 0° shell rotation iso 5355 alpine