B1 vs B2 boots: what changes and who needs which

What the ratings mean

The B scale grades how stiff a boot is, from B0 (flexible, not for crampons) to B3 (fully rigid mountaineering boot). The C scale grades crampons from C1 (flexible, strap bindings) to C3 (rigid, step-in bindings). A boot can take crampons of its own number or lower.

The system is widely used by UK retailers and some makers, but it is not a formal standard. Two boots both labelled B2 can differ in stiffness, and some boots sit between grades. Treat the rating as a guide and check what the boot maker says about crampon compatibility for that exact model.

B1 and B2 side by side

The table sets out the usual differences. Individual boots vary.

Heel welts and crampon bindings

The heel welt is the most visible difference. It is a ledge at the back of the sole that a C2 crampon's heel clip locks onto. With a toe strap at the front and a clip at the back, a semi-automatic crampon sits more securely than a strap-on crampon on a boot without welts.

C1 crampons attach with straps or a flexible cradle front and back, so they fit boots without welts. They are flexible enough to work with a B1 boot that still bends a little. Fitting a rigid C2 or C3 crampon to a B1 boot is not recommended, because the boot flexes and can break the crampon or pop it off.

Try the boot and crampon matcher →

Which suits what in the UK

Many winter hill walkers in Scotland, the Lake District and Snowdonia choose a B1 boot. It walks reasonably well on the long approach and takes C1 crampons for hard snow and ice on the tops and paths. People who plan steeper ground, such as easy winter gullies or exposed ridges in snow, often choose B2 boots for the stiffer platform and the more secure C2 crampon fit.

That is a general pattern, not a recommendation for any route. Conditions change daily, and the right boot depends on the route, the weather and your experience. A qualified mountain instructor or a recognised winter skills course is the right place to learn which kit suits which ground, and how to use crampons and an ice axe safely.

Note:Crampons and ice axes are dangerous without training. Before heading into winter mountains, learn from a qualified instructor, check the Mountain Weather Information Service and Scottish Avalanche Information Service forecasts and turn back if conditions are beyond your skills.

Before you buy either

Check the boot maker's own description: many state the crampon type they are compatible with. Take your crampons (or the boots) to a shop to check the fit, because welt shapes vary. Make sure your boots fit with thicker winter socks.

Stiffer boots are less comfortable on summer paths. If you only walk in winter a few times a year, a B1 boot can double as a robust three-season boot. For year-round walking boots without winter crampon use, see our guide to the best walking boots for UK hills, or our leather walking boots for sturdier options. Read walking boot ratings explained for the full B0 to B3 ladder.

Frequently asked questions

Which Scarpa boots are B2? Scarpa states crampon compatibility in its own product details. Check the maker's page for the exact model rather than relying on a retailer label.

Can I put crampons on normal walking boots? Only flexible C1 crampons on boots stiff enough for them, usually B1 or higher. Flexible B0 boots are not designed for crampons; consider microspikes for icy paths instead, and check the maker's advice.

Can I use B2 boots for summer walking? You can, but they feel stiff and heavy on easy paths.

Is a B1 boot warm enough for winter? Some B1 boots are lightly insulated, many are not. Warm socks help, but check the maker's details if you walk in very cold conditions.