K2 Cortex 105 W Zonal BOA Ski Boots - Women'sby K2

Product Info

The K2 Cortex is a bold leap forward in ski boot design, built for skiers who demand a locked-in feel and race-inspired control. Ditching traditional buckles, the Cortex features a dual BOA® Zonal Fit System that wraps the foot and cuff with micro-adjustable precision — delivering even pressure, enhanced comfort, and unmatched responsiveness.

Type of Terrain: All mountain

Ability Level:  Advanced

Technical Features

Flex Rating

BOA® Fit System

The BOA® Fit System, provides a performance fit engineered to enhance feel, and responsiveness while reducing pressure points by incrementally modulating the Alpine boot closure with precise micro-adjustments. Connected fit designed to uniformly wrap the foot and minimize downward pressure, increasing heel lock-down for improved power and edge-to-edge control. Engineered for confidence and built to withstand rugged terrain and inclement weather, BOA® dials and laces deliver extreme durability. Bayonet and cartridge system ensures continued operation, even after heavy impacts.

H+i1 Dial

Provides micro-adjustable, precision fit and quick release, with quality and durability guaranteed. The BOA dial platform features a breakaway design engineered to eject the dial cartridge upon severe impact without damaging the system, allowing skiers to pop the dial back into the bayonet midmountain. In the unlikely event that the system is broken, it can be easily repaired and replaced.

Powerlock Spyne

A performance-oriented walk mode designed for ski touring that offers a 50-degree range of motion. When in ski mode, Powerlock Spyne provides a powerful and secure connection for uncompromised downhill performance.

Precisionfit Pro Tour

Laceable, Pre Molded and Lasted with Ultralon heat moldable foams. Features an asymmetric tongue, a high-density power collar and a flex notch for increased range of motion while hiking.

Grip Walk Outsoles

Removable and interchangeable ISO 23223 alpine rockered soles collaboratively designed to work with Marker’s Grip Walk binding system for better grip and added comfort when walking and standing in boots, but doesn’t compromise the power transmission and release function between the boot and binding when skiing. Preinstalled.

Additional Details

Fitting Your Boots

 – To properly assess the fit of any boot you must lace or buckle it completely. The boot will feel small until you do this because your toes will be pushed to the front until laced or buckled. Also, keep in mind all boot liners stretch out and get bigger. 

– First, lace or buckle the boot loosely. Next, flex into the boot to drive your heel into the heel pocket. Doing this makes room for your toes. Lastly, finish lacing or buckling the boot in a flexed position.

– Be sure to wear the boots for at least 10 minutes fully laced or buckled before making a determination. Remember these boots are not made for walking, keep your knees slightly bent and flexed forward into riding position. When doing this your heels should be pushed into the back of the boot and your toes should be comfortable. 

– You should wear the thinnest sock you are comfortable with. Blood flow is the number one thing that keeps your feet warm. Adding more material around your feet with thicker socks increases the chances of reducing blood flow.

– To help your foot sit properly in your boot, you may consider an aftermarket footbed like Superfeet® or Sidas®. A footbed with arch support, not just cushion, helps align your foot in the shell and alleviates pressure points. Footbeds should be sized to your arch height and length, not your shoe size. 

– Spend some time choosing your boots, they are the most important piece of your gear!