The Tecnica Mach1 series is loaded with really great boots. The Mach1 105 is great for more advanced or progressing skiers (with average feet) that want to squeeze more performance out of their skis. The boot is powerful enough to bend almost any ski out there, but it's not too stiff to the point where all the comfort and forgiveness is thrown out the window. If you're a good skier and want a boot that is smooth, responsive, and relatively comfortable this is your it.