K2 B.F.C. W 90 Heat

Model Year
All-Mountain Walk
Last Width
Flex Index
Price (MSRP)

The Gist

Of the 2018 K2 B.F.C. W 90 Heat, one tester circled all 5's (the widest) and wrote, Huge! Another circled all 5's and wrote, Big! Big! Big! So this is a wide one, get it? And testers loved it—it was their favorite in the On-Off Area wide group. And it has a built in heater!

The Fit

The fit is so oversized that testers wrote warnings on their test forms that only truly wide, high-volume feet need apply, but they also had no hotspot complaints or shape concerns—it was foot-like in its shape, as best they could tell. The entry and exit is worth mentioning here—as easy as it gets (and pop the walk mode and it gets even easier). One tester claimed she could put it on with no hands and with all the buckles still done up. Flex feel was even and comfortable they said, and they agreed that the calf is comfortable here—even a grown-up cow's worth of leg shaft would be at home, they figured. Did we mention it has a heater?


Testers were shocked at how well the B.F.C. 90 W Heat wide load rode—the stiffness was on-target, the stance angles were neutral and enabled athletic movements, the edge power was solid and the quickness was there (if you could fill up the space with foot). Testers got aggro' with the Built For Comfort and found that, apparently, it was built for crushing it too. And did we mention that it has a heater?

Cool Features

Yes, it has a built-in heater integrated into the toebox of the liner. It's designed in partnership with Thermic, the aftermarket footbed heater company, but this is a woven heater element that encapsulates the toebox for more surrounded warmth. Testers tried it and liked it—easy to use buttons and they said it warmed up fast. The Apres Mode (that's what K2 calls it) cuff release is easy to use and testers report its range of motion is actually pretty good.

Sizes (MP) 
Hike Mode 
Heat Moldable Liner 
Boot width profile 
Also in this Collection 
B.F.C. W 90, $550; B.F.C. W 80, $450
Cantology Compatible 
Total Avg Score 
  • 2017-18 K2 B.F.C. 90 W Heat at America's Best Bootfitters Boot Test
  • 2017-18 K2 B.F.C. 90 W Heat at America's Best Bootfitters Boot Test
  • 2017-18 K2 B.F.C. 90 W Heat at America's Best Bootfitters Boot Test


  • “A truly wide boot! Will accommodate the widest foot, highest instep and largest calves!” -- Amy Post
  • “Super slipper—go big girl!” -- Liz Elling
  • “Exceeds all expectations! Ooh la la, heated bedroom slippers that kick ass!” -- Ashley Teren
  • “So soft--like baby lamb! Maybe it's for the ex-racer who's getting back into the game after several kids!” -- Emily Poore

This boot available at...

Seattle, WA
Warren, VT
Taos Ski Valley, NM
Telluride, CO
Telluride, CO
Ellicottville, NY

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