The Kaliber 110 MV GW BOA offers advanced skiers precision fit and top performance with a brand new construction. Specifically engineered to integrate the BOA Fit System, this mid-volume boot has a microadjustable fit that wraps around the leg and foot. The bi-injected cuff and shell feature stiffer plastic in the back for power, with softer plastic and an angled overlap over the foot. The newly-designed Synapse Pro liner is thinner and more anatomical, with Graphene woven in to help regulate temperature. Head Kaliber 110 MV GW BOA Ski Boots | 28.5 | Christy Sports