Which crampons fit which boots?

The pairing rules

Boots and crampons are graded on matching scales. A boot rated B2 can take a C2 or C1 crampon, but not a C3. The table below summarises the usual pairings.

Check a pairing with the matcher →

The three binding types

Strap bindings (C1) use nylon cradles or straps at the toe and heel, tightened with a strap over the foot. They fit almost any boot shape and do not need welts, which is why they suit B1 boots. C1 crampons are usually flexible or articulated so they move with a boot that still flexes slightly.

Semi-automatic bindings (C2) combine a toe strap or cage with a heel lever clip. The clip locks onto a heel welt, a ledge moulded into the back of the sole on B2 and B3 boots. This holds the crampon more securely than straps alone.

Automatic or step-in bindings (C3) use a wire bail at the toe and a heel clip. They need welts at both ends and a fully rigid boot, which is why they are paired with B3 mountaineering boots.

Why flexible boots and crampons do not mix

A normal walking boot bends at the ball of the foot with every step. A crampon attached to it is forced to bend too. Rigid crampons can crack under that repeated flexing, and even flexible ones can shift or detach. That is why B0 boots are not recommended for crampons.

On icy lowland or forest paths, some walkers use microspikes, which are chains with small spikes on a rubber harness. They are not crampons and are not suitable for steep snow or mountain terrain. Check the maker's guidance for any traction device you consider.

Note:Using crampons safely takes practice: how to walk, how to place your feet and when to take them off. Learn from a qualified mountain instructor or on a recognised winter skills course before relying on them in the hills.

How to check a fit

Crampons and boots both vary in shape, so a pairing that works on paper can still fit badly. A secure fit matters more than matching numbers.

1. 1

   Check the boot maker's information for the crampon types it accepts.

2. 2

   Take the boots and crampons to a shop with staff who can check the fit, or follow the crampon maker's fitting instructions closely.

3. 3

   Adjust the crampon length so the front points stick out just beyond the toe and the heel post sits snug.

4. 4

   Fit the bindings and shake the boot hard: the crampon should not move or rock.

5. 5

   Check that straps are not over the boot's flex point or pressing on the foot.

6. 6

   Recheck the fit with the socks you will wear in winter.

Choosing boots for winter

If you are buying boots with winter walking in mind, decide what kind of routes you will do with an instructor's or experienced club's advice, then choose a boot whose maker states compatibility with the crampons you need. Make sure it fits with thicker winter socks and that you can walk in it comfortably on the approach.

For three-season walking, choose a comfortable B0 boot; our best walking boots for UK hills guide is a good start, and leather walking boots covers sturdier models. Read walking boot ratings explained for the full B ladder and B1 vs B2 boots for the most common winter choice.

Frequently asked questions

Can I put crampons on hiking boots? Only on boots stiff enough for them, usually B1 or above with C1 crampons. Check the boot maker's guidance.

Do C1 crampons fit any boot? They fit most shapes thanks to strap bindings, but the boot still needs to be stiff enough. B0 boots are not recommended.

What is a heel welt? A ledge at the back of the sole that a semi-automatic or automatic crampon's heel clip locks onto.

Are microspikes the same as crampons? No. Microspikes are for icy paths and are not designed for steep snow or mountain terrain.