Fit + Tech
Cortex 105 BOA® Women's Ski Boot 2027
Mondo 22.5 – 27.5
Women's
Flex 105 · BOA®
Find Your Fit
| Mondo | US Women's | US Men's | UK | Euro |
|---|---|---|---|---|
| 22.5 | 5.5 | 4 | 3.5 | 35.5 |
| 23.5 | 6.5 | 5 | 4.5 | 36.5 |
| 24.5 | 7.5 | 6 | 6 | 38 |
| 25.5 | 8.5 | 7 | 7.5 | 39.5 |
| 26.5 | 9.5 | 8 | 8.5 | 40.5 |
| 27.5 | 10.5 | 9 | 9.5 | 42 |
Ski boots are sized in Mondo point (cm foot length) — primary measurement for ski boot fit. 6 sizes from Mondo 22.5 through 27.5 in half-Mondo steps. US Women's is the primary column for this women's-specific build; US Men's equivalent shown for cross-reference. Standard ski boot conversion: Women's = Men's + 1 size. Compatible with all standard alpine ski bindings (ISO 5355 / GripWalk soles).
Component Breakdown
BOA® Fit System — Zonal Precision
BOA® Fit System delivers micro-adjustable closure — precise, custom fit that locks in the heel and lower leg for direct energy transfer. Zonal configurations allow independent tightening for fine-tuning fit and pressure distribution.
Flex 105 — Race-Boot Responsiveness
Flex 105 (medium-stiff) delivers race-boot-level responsiveness without sacrificing all-day wearability. Tuned for hard-charging female skiers who ski bell to bell — keeps you charging while others call it quits.
Women's-Specific Last
Built on a women's-specific last — accommodates the anatomical differences in women's feet (narrower heel, higher arch, smaller volume). Better out-of-the-box fit for women skiers, no break-in adjustments needed.
Performance Liner
Performance liner delivers precise foot wrap and responsive energy transfer. Heat-moldable for custom fit — conforms to individual foot shape over time. Designed for the high-output skier who needs direct connection to the ski.
All-Day Wearability
"Without sacrificing all-day wearability" — the Cortex 105 is built for skiers who charge from open to close. Designed to handle long ski days without the hot spots or pressure points that plague race boots.
Cuff Geometry — Women's Proportions
Cuff geometry tuned for women's proportions — shorter cuff height and adjusted forward lean angle. Matches the female calf geometry for natural stance and efficient energy transfer without binding pressure.
Quiver-of-One Women's Hard-Charger
"Ultimate high-performance boot for the hard-charging female skier" — blends precision and comfort for skiers who want race-level responsiveness without sacrificing all-day wearability. One boot that does everything.
Best For: Freeride, Big Mountain, Powder, Speed
Per the page, the Cortex 105 BOA W is best for Freeride, Big Mountain, Powder, and Speed — versatile high-performance build for advanced women skiers.
Mounting & Compatibility
- Compatible with all ISO 5355 alpine ski bindings
- Compatible with all GripWalk (ISO 23223) bindings
- Standard 30mm ski boot hole pattern — fits all alpine bindings
- DIN setting range: typically 3-12 for this flex (check binding specs)
- Forward lean adjustable via rear spoiler
In the Box
- 1× K2 Cortex 105 BOA® W ski boot (left or right, Mondo size as ordered)
- 1× Boot bag / storage sack
- BOA® laces installed
- GripWalk sole pads pre-installed
Rider Profile
Flex Rating
Best For
Freeride, Big Mountain, Powder, Speed
Skill Level
Advanced – Expert
Fit System
BOA® Zonal
Built for Hard-Charging Female Skiers — Race-boot responsiveness without all-day compromise. BOA® Zonal precision + women's-specific last + 105 Flex energy transfer — charge bell to bell.
Prepared with intention.
Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.
Passion drives us
At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.
