Happy feet contribute heavily to a fun day on hill, and the Rossignol Alltrack Pro 100 MV Ski Boot contribute heavily to happy feet. For blood flow, warmth, and comfort these boots pair a mid-wide100mm last with a thermo-moldable liner that locks your heel in place without pinching. Once you are happy you will be skiing more and more, during this time the 100 flex will promote proper turn initiation technique as well as ample forgiveness between edges.