The Kaliber 100 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 midvolume 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.