SITE LOGIN
TOP VIDEOS
BOA Fit System K2 Mindbender 140 Boots
The introduction of BOA system into ski boots has seen several different applications from different boot manufacturers. The primary goal from BOA is to have the BOA Fit System applied to ski boots in a way to increase performance. I would add that an important part of increased performance is having a better fitting boot that is also more comfortable. K2 has integrated the BOA system into five of their seven ski boot models (Cortex, Recon, Antem, BFC and Mindbender) over the last couple of years. K2 describes the K2 Mindbender 140 BOA as their “stiffest, most high-performance boot yet.’ So the Mindbender 140 seems to be a great boot to really test out the BOA Fit System. Last year we reviewed the K2 Mindbender 130 and the Mindbender 140 has quite a few upgrades to the 130. You can read about that review here.
The K2 Mindbender 140 BOA aims to deliver a high level of performance through an innovative BOA Fit System and redesigned Intuition liner. This review evaluates whether this boot lives up to K2's claim of being their 'stiffest, most high-performance boot yet,' focusing on fit, comfort, and performance in challenging conditions.
- SHOW THE REST OF THE REVIEW / PHOTOS / VIDEOS
-
Initially, adjusting to the BOA system required a different approach than traditional buckles. Due to my high arch, I typically maintain a loose fit in the lower boot. However, with the Mindbender 140, a loose BOA resulted in excessive heel lift and lateral movement, compromising stability. On subsequent runs I kept tightening the lower BOA which kept significantly improving the foothold, without creating pressure on my arch, resulting in a more direct connection to the ski. Ultimately, I tightened the BOA as much as a could which really improved my confidence with the boot and did not compromise comfort. 
The 2025 Mindbender 140 BOA also features a redesigned Intuition Wrap Liner optimized with the BOA system. Unlike traditional tongue designs, this liner wraps around the foot and calf, providing a uniform, secure fit. This design eliminates pressure points and enhances comfort, especially in the shin area. The redesigned liner, in combination with the BOA system, improved the overall fit of the boot, in comparison to traditional liner models.
Like other Mindbender boots the shell is constructed from Thermoplastic Urethane (TPU). K2 utilizes their "Powerlite Shell" technology, which involves varying the thickness of the TPU and using different stiffness grades. This allows for a balance of lightweight agility and powerful energy transfer. The cuff is made with Pebax®, a lightweight and durable material known for its consistent flex across varying temperatures.Materials:
Lower - TPU
Cuff - Pebax Bioresin
Sole - Vibram GripwalkFeatures:
There are a lot of advanced features that have gone into the K2 Mindbender 140 BOA ski boots. They have been designed for advanced to expert skiers who demand high performance in both resort and backcountry settings. Here's a breakdown of their key features:
- BOA® Fit System:
- This system provides micro-adjustable precision fit, enhancing feel and responsiveness.
- It improves heel hold and edge-to-edge control.
- The system is designed for durability in rugged terrain and harsh weather.
- Flex Rating:
- A very stiff flex rating of 140, catering to aggressive skiers.
- MultiFit™ Last:
- Accommodates a range of foot shapes (97mm to 100mm), with heat-moldable capabilities for a custom fit.
- Powerlite Shell:
- A lightweight yet responsive shell construction, using varying thicknesses and multiple TPU types.
- Intuition PowerFit Wrap BOA® Liner:
- A heat-moldable liner with a BOA® system for enhanced adjustability and hold.
- Designed for increased power and energy transmission.
- Powerlock Spyne:
- A performance-oriented walk mode with a 50-degree range of motion, providing a secure connection for downhill performance.
- GripWalk Outsoles:
- Removable and interchangeable GripWalk soles for improved walking comfort and grip.
- Integrated Tech Fittings:
- Compatible with both tech and alpine DIN bindings.
- FastFit Instep:
- Softer TPU in the instep for easy entry and exit.
- Modular Honeycomb Boot Board:
- Features hard and soft inserts for customizable dampening and power transfer.
- Pebax Cuff:
- Lightweight and eco-friendly cuff material for consistent flex.
- Power Plate:
- Adjustable frontal cuff spoiler for increased stiffness and responsiveness.
Verdict:
We were already impressed with the K2 Mindbender BOA 130 with its impressive foothold and comfort, however, the Mindbender BOA 140 dials (pun intended) that foothold and comfort up a notch. Where the K2 Mindbender BOA 140 really preforms is in variable terrain and variable conditions. I purposely took these boots to the resort on a day when the conditions were icy and choppy. The Mindbenders really allowed me to attack the marginal conditions with confidence.
Often stiffer boots sacrifice comfort for more direct control, however, with the K2 Mindbender BOA 140 you get the best of both worlds. And with the heat-molded shell and cuff you could increase the fit even more.
Who and Where:
I can see the Mindbender BOA 140 being most at home at resorts like Kicking Horse and Revelstoke that have a lot of expert terrain both on the resort and in the side country. They are designed for advanced to expert skiers.
- BOA® Fit System:
 |
PROS:
|
 |
CONS:
|
SPECS:
Price: $999CAN / $949US
Size: 25.5-30.5 (half sizes)
Weight: 3,632g / 4lb (both boots)
Last: 97 - 100mm
Flex: 140
Range of Motion: 50°
RATING: |
9/10 |
| Fit/Comfort: | 2/2 |
| Cuff Rotation: | 1.5/2 |
| Function: | 2/2 |
| Weight: | 1.5/2 |
| Quality/Price: | 2/2 |
Did we miss something? Are we totally out to lunch? Let us know what you think. People like/dislike gear for different reasons so chime in below and we'll get a well-rounded evaluation. You'll need to login or register before you can comment but it only takes a few seconds, then you're good to go.
Leave a Comment:
