Built for skiers who don’t slow down when the weather turns or the terrain gets wild, the K2 Cortex 105 Zonal BOA® Women’s Boot is equal parts precision instrument and rugged mountain companion. Designed for hard-charging all-mountain and freeride skiers, it brings a level of fit and control that’s rarely matched—merging race-boot responsiveness with the comfort, adjustability, and durability needed for long, demanding days on snow.
The Cortex 105 Zonal BOA® takes women’s ski boot design to new ground with its dual-zone BOA® Fit System, allowing skiers to fine-tune fit and pressure across the forefoot and cuff independently. The system’s micro-adjustable dials and low-friction lace guides create a seamless, customized hold that eliminates pressure points and enhances power transfer through every arc and edge set.
Inside, the EliteFit Sport Liner provides a high-performance interface between foot and shell. With supportive ankle pockets and a medium-volume fit, it balances stiffness and plush comfort for all-day stability without fatigue. FastFit Instep construction uses softer TPU in key flex zones to make stepping in and out smooth and effortless—even on cold mornings.
The TPU-coated upper and lower shell adds an extra layer of armor against scuffs, moisture, and impact, while maintaining a consistent flex pattern in fluctuating temperatures. Paired with a 45mm cam-style power strap, the boot delivers confident energy transmission from shin to ski, letting you drive turns with race-level precision. The GripWalk® outsoles—preinstalled and compatible with ISO 23223 bindings—offer better traction and natural walking motion for parking lot treks or ridge approaches without compromising downhill power.
Engineered on K2’s MultiFit™ Last, the Cortex accommodates a wide range of foot shapes while maintaining a performance-oriented feel. Whether you’re charging big lines, hunting powder stashes, or carving high-speed corduroy, this boot delivers unwavering control and comfort in every condition.
BOA® Fit System (Zonal Dual-Zone): Independent upper and lower dials for micro-adjustable, personalized fit and balanced pressure distribution.
EliteFit Sport Liner: Medium-volume liner with strategic support zones for superior comfort, stability, and rebound.
FastFit Instep: Softer TPU material in the instep area for smooth, easy entry and exit—even in cold weather.
TPU Coated Shell (Upper & Lower): Rugged thermoplastic polyurethane coating enhances durability, water resistance, and structural integrity.
MultiFit™ Last: Adapts to a wide range of foot shapes; designed for anatomical precision without compromising responsiveness.
45mm Cam Power Strap: Wide, non-elastic strap delivers solid cuff closure and excellent energy transfer at high speeds.
GripWalk® Outsoles (ISO 23223): Rockered soles improve walking comfort and grip while maintaining full binding compatibility.
All-Mountain/Freeride Construction: 2-piece shell design optimized for big-mountain performance and variable conditions.
Medium Flex (105): Ideal balance of stiffness and forgiveness for advanced all-mountain and freeride skiers.
Best For: All-Mountain, Big Mountain, Powder, Speed
Ability Level: Intermediate to Advanced
Flex: 105
Weight: Approx. 1800g (per boot)
The K2 Cortex 105 Zonal BOA® Women’s Boot delivers a rare mix of fine-tuned precision, rugged protection, and dialed-in comfort for serious skiers who demand more from every run. Powerful, intuitive, and ready for anything, it’s a boot that inspires confidence from the first chair to the last lap.
