Choosing the perfect flex rating for ski boots is essential for staying comfortable on the mountain, but can be challenging if you like to ski all kinds of terrain. Tecnica's Mach1 MV 105 Boot offers a perfect balance between hard-charging support and maneuverable forgiveness thanks to the 105 flex, which will encourage you to slash through mid-morning powder glades and carve long turns on steep groomers in the afternoon. Thanks to Tecnica's innovative C. A. S. shell and liner technology, the boot can be fully customized to adhere to specific characteristics of your foot. The 100mm last is catered to medium-volume, ordinary foot shapes and the micro-adjustable aluminum buckles let you make on-the-fly adjustments while skiing. The inner liner combines merino wool and celliant to ensure your toes stay nice and toasty even when you're spending the bulk of your day with your feet submerged in deep powder snow.