Winter is coming!
For some people that is not a welcome statement, but for those of us who love winter sports then the first dusting of snow on the high ground gets us excited about getting out on the ice and snow.
The first in our series on winter mountain gear will explain the differences between boots and how they are graded for use with crampons.
BOOT GRADING FOR CRAMPONS
Boots for any climb over snow and ice need to be of a type that will allow fitting of crampons. Boots are graded according to their compatibility with different types of crampon.
Boots graded B0 are not suitable for use with crampons. The sole is not stiff enough to prevent them moving differently to the crampon with the result that the crampons will move around and may come off all together. They are also not very stiff in their upper section and may not provide enough support to your ankle or enough rigidity to allow ‘edging’ of the boot in snow when not using crampons.
Boots Graded B1 are suitable for use with strap-on C1 crampons for use on moderate snow and ice conditions. They have fairly stiff soles so that the crampon does not loosen or come off as the boot flexes during walking. They are also fairly stiff on the upper part so that they provide good ankle support and allow edging in the snow when not using crampons. They are however not so stiff that they are too uncomfortable to walk in off the snow.
Boots Graded B2 are suitable for use with C1 or C2 crampons. C2 crampons have a clip lever at the back and therefore require the boot to have a protruding shelf at the heel for the end of the heel lever to engage with. The boots have a stiffer sole than B1 boots and will help to keep the crampon in place on moderate mountaineering climbs. Some B2 boots are still flexible enough to be used on an approach walk although this is very dependent on the materials and construction of the upper.
Boots Graded B3 are suitable for use with technical C3 crampons. The boot is fully rigid and allows the crampon to be used on more technical climbs (where there is likely to be sustained use of the crampon’s front points) without the crampon losening. B3 boots are likely to be very uncomfortable for approach walks and trekking as they are rigid and often heavily insulated.
If you choose to purchase your own crampons prior to the trip please ensure that you take your boots to the shop and ask a suitably experienced person to check the fit of the crampons with the boot. Some combinations of boot and crampon do not provide a good match and can lead to poorly fitting crampons and consequent problems on the mountain. If you are planning on using overboots to upgrade the wrmth of a boot you will also have to check carefully if the crampon will be secure. You may need to cut out sections of the overboot to align with heel or toe bails.
If you are booked onto an Adventure Alternative trip then you get full access to our experienced staff before the trip so that you can be sure that you get the right gear.
Trips where you would need crampon compatible boots include:-
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