K2 Cortex 110 BOA Men’s Ski Boots. Designed for advanced skiers who crave both precision and comfort, the K2 Cortex 110 BOA® delivers a mid-stiff flex paired with micro-adjustable fit. Featuring a single BOA® dial on the lower shell and dual cuff alignment, this boot gives you fine-tuned control with locked-in heel hold-no pressure points, no guesswork. Built on a low-volume 96-98? Mm MultiFIT last, the Cortex 110 combines a 110 flex TPU shell with a heat-moldable EliteFit Plus liner, FastFIT instep, GripWalk soles, and an Energy Bolt Spine. Fully customizable and ready for the mountain, this boot offers responsive performance with a versatile edge. BOA® Fit System (lower shell): micro-adjustable dial wraps precisely across the foot for enhanced control and reduced hot spots. Low-Volume MultiFIT Shell (96-98? Mm last): narrow-fit shell ensures effective power transfer and anatomical wrap. EliteFit Plus Liner: full-lace, heat-moldable liner enhances comfort, warmth, and a personalized fit. FastFIT Instep & GripWalk Soles: TPU instep simplifies entry/exit; GripWalk soles offer superior traction on snow and ice. Energy Bolt Spine & Dual Cuff Alignment: rear support structure delivers smoother flex; adjust cuff angle to fine-tune stance. Velcro Power Strap: tapered strap secures snug fit and responsive power transfer. Closure Type : Strap, Buckle, BOA. Best Use : Snowsports, All Mountain Skiing. # of Buckles : 2.