Built for women who demand the highest level of performance from every turn, the K2 Cortex 125 Zonal BOA® is the most powerful women’s boot K2 has ever crafted. This boot takes no shortcuts—offering a precision-tuned fit, uncompromising response, and enough backbone to drive the burliest lines on the mountain. Designed for expert skiers who charge big terrain with speed and confidence, the Cortex 125 pairs the cutting-edge dual-zone BOA® Fit System with K2’s low-volume, performance-minded Cortex shell for unmatched control and connection.

The dual Zonal BOA® Fit System allows you to independently adjust the upper and lower zones for equalized pressure, perfect wrapping, and a dialed-in feel from cuff to toe. The EliteFit Pro liner delivers a race-inspired hold, using thermoformable foam and precision-mapped support zones for a snug, powerful fit that stays locked in all day. K2’s TPU Coated Shell and Cuff add impact resistance and durability without extra weight, while the FastFit Instep ensures smooth entry and exit.

A 45mm Elastic Cam Buckle Strap locks the cuff securely while flexing naturally with your movement, offering the perfect balance of power and comfort. Preinstalled GripWalk® Outsoles add grip and comfort when walking, while maintaining seamless energy transfer in the binding. With a 125 flex and narrow MultiFit™ last (96–98mm), this boot is laser-focused on high-performance skiing—precise, powerful, and purpose-built for the women who send.

Features

• Dual-Zone BOA® Fit System: Two micro-adjustable dials control upper and lower zones independently for a fully customizable, even-pressure fit.

• EliteFit Pro Liner: Precision-mapped liner with thermoformable foam for maximum foot retention, support, and responsiveness.

• Powerful 125 Flex: Tuned for advanced and expert female skiers who demand immediate response and confident energy transfer.

• TPU Coated Shell and Cuff: Rugged thermoplastic coating enhances durability, weather resistance, and structure while keeping weight in check.

• FastFit Instep: Softer TPU in the instep for quick, easy entry and exit without sacrificing shell integrity.

• 45mm Elastic Cam Buckle Strap: Dynamic cuff closure that flexes naturally while maintaining aggressive forward support.

• GripWalk® Outsoles (ISO 23223): Rockered soles improve traction and walking comfort without affecting ski performance.

• MultiFit™ Last (96–98mm): Performance-oriented shell accommodates a variety of foot shapes within a low-volume design.

• 5355 Alpine Outsole Compatible: Delivers consistent, predictable release values with all ISO 5355-certified alpine bindings.

Specifications

• Flex: 125

• Last: 96–98mm (MultiFit™ Low Volume)

• Weight: 1777g @ 24.5

• Shell Material: TPU Coated

• Liner: EliteFit Pro (Thermoformable)

• Closure System: Dual-Zone BOA® Fit System + 45mm Elastic Cam Buckle Strap

• Sole: GripWalk® ISO 23223 (Preinstalled) + 5355 Alpine Compatible

• Cuff Alignment: Dual

• Category: All-Mountain / Freeride

• Skill Level: Advanced to Expert