What Our Gearhead® Experts Are Saying:"I’ve never had a boot wrap my foot this well. The dual BOA® system on the Cortex 125 W gives me an even, locked-in fit that feels super powerful on big lines. It’s responsive, stiff, and surprisingly comfortable all day."We trust the K2 Cortex 125 Zonal BOA® Ski Boots when we’re lining up steep fall lines and demanding freeride descents. K2’s most performance-driven all-mountain boot for aggressive skiers, the Cortex 125 W features a fully integrated BOA® Fit System on both the cuff and shell, delivering a customizable, micro-adjustable fit with consistent pressure and zero hot spots. The Zonal wrap system hugs our foot from ankle to forefoot, maximizing comfort and direct power transfer, while the 125 flex shell—paired with the EliteFit Pro liner—delivers race-level energy without sacrificing ride feel. Engineered with a True LV fit, TPU shell, and thoughtful finishing touches like a lace-up liner, adjustable tongue, and included GripWalk soles, this boot is ready for big-mountain speed, deep powder lines, and high-angle carves.