K2 BFC 100 BOA vs Nordica Sportmachine 3 100 BOA: Comfort Boots Compared

Both have a 100 flex, a BOA dial and GripWalk soles. How the K2 BFC 100 BOA and Nordica Sportmachine 3 100 BOA differ on width, volume, sizes and price.

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Dial boots have caught on fast, and these two show why. The K2 BFC 100 BOA was the current ski boot stocked by the most US shops on 31 October 2026 (41 shops), and the Nordica Sportmachine 3 100 BOA was fifth (31). Both are men's comfort-minded boots with a medium 100 flex, a BOA dial and GripWalk soles, both aimed at intermediate and advanced skiers. Where they differ is in how much room they give your foot.

We haven't skied these two for this comparison. It's built from the makers' published specs and the prices we track.

The specs side by side

Fit: two ways to make room

Both boots are built for feet that find a typical performance boot tight, but they get there differently.

K2 lists the BFC's last at 100 mm with a range up to 103 mm, and calls its volume high. "Volume" covers more than width: it's also the room over the instep and around the ankle. A high-volume boot suits feet that are tall or thick as well as wide.

Nordica lists the Sportmachine at a 102 mm last and calls it medium-wide. On paper that's a little wider at the forefoot than the BFC's starting point, with less overall volume, so it may suit a foot that's wide at the front but not especially tall.

If you can, try both. No spec sheet can tell you how a shell matches your foot, and two boots with the same numbers can feel very different.

Closure and features

Both use a BOA dial, which tightens the shell evenly and is easy to adjust with gloves on. Nordica lists two micro-adjustable buckles alongside the dial, while K2's spec lists the dial and a wide 40 mm strap. More buckles give more ways to fine-tune; fewer make a boot quicker to get into. Our guide to BOA ski boots covers what a dial changes in practice.

Both have GripWalk soles, which make walking easier but need a compatible binding. Most current alpine bindings accept them; if yours are older, check first. How to choose ski boots explains sole types.

Sizes

The Nordica runs to mondopoint 32.5, two sizes beyond the K2's 30.5, so skiers with very large feet only have one choice here. Both start at 24.5. For women, the K2 BFC 95 BOA and the Nordica Sportmachine 3 85 W BOA are the related women's models, stocked by 32 and 24 US shops respectively. For sizing help, see our ski boot size chart.

Price

The list prices are almost identical, a cent apart. In the shops it was a different picture on 31 October: the BFC ranged from $274.95 at the cheapest shop to $599.95, while the Sportmachine held between $529.99 and $550. A deep discount like the BFC's lowest price may cover only some sizes, so check yours. Last season's Sportmachine 3 100 BOA was in stock at 7 shops from $529.95, barely below the current version.

Which one should you choose?

Choose the K2 BFC 100 BOA if your feet are high-volume, not just wide, you like a simple dial-and-strap closure, or you can find your size near its lowest price.

Choose the Nordica Sportmachine 3 100 BOA if your forefoot is wide but your foot isn't especially tall, you like the extra adjustment of buckles and an insulated liner, or you need a size above 30.5.

Neither is a boot for aggressive experts, who will usually want a stiffer flex. If you're not sure where you fit, read ski boot flex explained, then compare every model on our ski boots page.