104mm last: Comfort is key for skiers matching up to this last width. * 70 Flex Index: This boot has a flex rating of 70, which is best suited for beginner and intermediate skiers. * Micro-adjustable aluminum buckles: These aluminum buckles can be moved to adjust for size, so if the default position of the buckle and the teeth is too wide or too narrow, you can move it until it fits. * 35mm strap: Wider than average strap at the top of the boot to help keep the boot together and to give good performance while skiing. * SensorFit Technology: Rossignol"s Sensor boots are anatomically designed to have direct contact with the foot"s "balance receptor points" (big toe, little toe, heel) to give a comfortable fit as well as greater power