The Atomic Redster FIS 110 ski boot features a medium flex, so it’s the Redster World Cup for racers looking for a slightly more moderate flex pattern. That said, the ultra-stiff Carbon Spine still delivers incredible acceleration and lateral quickness, with great power transmission so you can carve every turn precisely and aggressively. It has a narrow 95mm racing last for an authentic race-room fit. Plus our unique Memory Fit technology means you can completely personalize your fit in the shell, cuff and liner. The Atomic Redster FIS 110 comes with our medium Flex Frame, but you can also buy and add a stiff or soft Flex Frame to fine-tune the sensitivity of your sole. And the Rotational Cuff and Micro Cuff Alignment also mean you can tweak this custom ski boot to your needs, style and physique.