The new Tecnica Mach 1 90 makes a perfect set of boots for the skier who has a tall instep, medium to narrow forefoot and medium to narrow shaft of the leg. Made with Tecnica's I-Rebound system the Mach 1 90 uses four metal to metal connection points that affix the lower shell to the upper cuff that provide exceptional rearward support, forward flex resistance, and a strong rebound for a boot that has a sturdy flex and more control over your skis. Tecnica wants to make boots that are easy to get in and out of, hence the Quick Instep Construction that has a softer piece of plastic molded on top of your foot that does not inhibit the performance, but aids in entry and exit. An Ultra Fit Pro Liner is easily thermoformable by warm air to accelerate the breaking in process, for a comfortable and performance oriented fit. If you are a strong intermediate to advanced skier who has a medium to narrow forefoot and shaft of the leg, the new Tecnica Mach 1 90 will be a great boot for you.