ALL THE COMFORT AND TECH YOU EXPECT - THE K2 B.F.C. 90 HEAT 2020 SKI BOOT. With these boots, you won't have to endure another day of numb toes and wasted opportunities. The K2 B.F.C. 90 Heat 2020 Ski Boot features a CushFit EVA foam liner for unparalleled comfort and support and the Therm-ic Heat System with three heat settings that provide warmth for between 4 and 19 hours. The PowerFuse SpYne adds strength and power, while the optimized materials eliminate excessive vibration over rough terrain. FEATURESLast: 103 mm GCo Wide and high volume fit for immediate comfort and wider feet.Hands Free Entry GCo Dual material overlap for intuitive and easy hands-free exit and entry.Women's Adjustable Cuff GCo Rear of cuff is adjustable for varying calf sizes.Women's Specific Last GCo A lower cuff height, volume and narrower heel to accommodate womenGCOs lower leg and foot shapes.Flex: 90 GCo Medium-stiff flex for intermediate to advanced women skiers.CushFit GCo Lasted with a blend of open cell and EVA foam for an extremely comfortable yet supportive fit.Therm-ic Heat System GCo Integrated heating system to keep your feet warm on cold days. Increases mobility and performance of foot muscles. Three heat settings provide warmth from 4 to 19 hours. Fully charges in 6 to 7 hours with a USB cable.PowerFuse SpYne GCo A rear co-injected GC YGC shaped design that adds strength and power to the Energy Interlock, the PowerFuse SpYne maximizes fore/aft flex efficiency and lateral stiffness for sustained performance and responsiveness in all terrain. Because of the SpYne, K2 is able to optimize materials in the cuff and shell, eliminating excessive vibrations in rough terrain.TECH SPECS40mm Velcro PowerstrapDual Material Replaceable ISO 5355 OutsolesNatural Stance / Natural Stride GCo Supportive flex profile and design for a natural stance when standing in line at the ticket office, tram or chairlift and a natural stride when walking through the parking lot, trudging up the stairs or across the village.Cuff Alignment GCo Dual +/- 1-|