The Tecnica Mach 1 100 is a ski boot best suited for intermediate to expert skiers. The shell and liner can both be custom fitted to the skier's lower leg and foot shapes. The Mach 1 100 usually fits best on men with average to slim forefoots and average to slim calves. A softer plastic is used over the instep in this offering from Tecnica so that the skier can slip in and out of the boot more easily. The 35mm Powerstrap at the top of the boot ensures there will be no slippage anywhere when you're ready for shreddy.