Men's Ski Boot Best Fits a Narrow Forefoot and Medium Shaft of the Leg Prolite Construction Energy Backbone Memory Fit Legendary Hawx Feel 3D Silver Liner The Atomic Hawx Ultra 100 is an awesome option for any advanced intermediate to expert level guy with a narrow forefoot and medium shaft of the leg. The mild 100 flex is stiff to get performance but soft enough for someone who is still learning to perfect their technique. Starting with Prolite Construction which takes the smallest profile possible and then adding on all the key components for a lightweight boot that doesn't sacrifice on performance. Memory Fit is an advanced heat fitting technology that allows the shell, cuff and liner to be custom molded to your feet after taking it to a qualified ski shop and properly baked. The Energy Backbone is a spine that runs up the back of the shaft for a little more supports and consistent flex. Get off of rentals and get your first pair with the Atomic Hawx Ultra 100. Atomic Men's Hawx Ultra 100 Ski Boot