The performance-oriented Challenger 120 features Adaptive Fit Technology, which allows the width of the last to move 3-mm by the turn of a key. The Perfect Fit liner is moldable in the tongue, cuff and ankle pocket and adapts the foot to the shell. Head’s take on cuff mobility, called Power Ski Hike, uses a metal band and pin connection. Flexible, spine-like buckles offer better wrapping and comfort.