The Head Challenger 110 is the perfect balance between comfort and performance with a walk mode thrown in there for touring capability. This boot features Head's Adaptive Fit Technology where the foot width can adjust between 99-101mm by turning a screw on the boot sole. This technology ensures a comfortable fit that normally can't be attained in most high end boots like this one. The Challenger has a 110 flex which is intended for powerful skiers, but there is also a Ski/Walk Mode that unlocks the the upper cuff when hiking or walking to the bar. The Challenger 110 is a great choice for advanced or expert skiers who ski all over the mountain but maybe want to dip their toes into the backcountry.