Guide to Mountaineering Boot Grades: B0, B1, B2 & B3

I’ve been asked recently what the different gradings mean for boots and crampons in preparation for winter, so here’s a simple guide which should help.

Mountaineering Boot Grading

The widely recognised indication of a boot suitability for mountaineering disciplines is referred to as the B-rating. They rank from B0 (incompatible with crampons) to B3 (Technical mountaineering boots).  

These are your traditional walking boots. They have flexible soles and uppers, consequently they take very little time to break in and are perfect for 3 season use below snowlines. Despite the advances of technology, even with flexible linking bars, crampons are unable to flex as much as a B0 boot. The result of putting a crampon on a B0 boot would be the binding between crampon and boot being compromised, resulting in the crampon pulling loose, this potentially could be hazardous. Crampon straps can dig into the upper of B0 boots that may lead to discomfort for the user; moreover the cradles and bindings of crampons could puncture soft uppers leading to the failure of a boots waterproofing. As a result for due to safety considerations, B0 boots are not recommended to be used with crampons.

These are considered to be a all round 4 season walking boots, they are stiffly constructed for long mountain days, scrambles and winter hill walking. They have a rigid midsole while the uppers are constructed from leather or fabric, it is common to find a rubber rand surrounding the upper to improve durability. These are only compatible with C1 ‘Strap on’ crampons and the combination would be more than adequate for winter fell walking.   

Suitable for the summer alpinist and for the Scottish winter climber. These boots have both stiff midsoles and uppers, moreover there is just enough flexibility for general walking. The thicker uppers mean that these are slightly warmer than their B1 counterparts and models tend to have a degree of insulation. B2’s have a heel ledge to allow the fit of a C2 crampon allowing for a secure fit and all round versatility.   

The best of the best, designed for full on mountaineering, year round alpinism, mixed and ice climbing. B3s have the stiffest soles and uppers available, allowing for unparamounted support on lateral and medial axis ideal for all aspects of mountaineering. The category is split between both technical climbing models and high altitude double boots. Heel and toe ledges allow for the fitting of C3 crampons although it is not uncommon for them to be paired with a lighter C2.

If you wish to do some winter mountaineering please get in touch with me on 07534 387 152 or check out my courses for this winter;

Published by Diving & Mountaineering Instructor

I am a passionate adventurer, loving being in the mountains walking, climbing, scrambling as much as I love being under the water exploring shipwrecks, mines and caverns, or in search of treasure in the depths. I am a Mountain Instructor (MIA), a Winter Mountain Leader, a Scuba Diving Instructor (BSAC, TDI, SDI, IANTD), a skipper for CAT3 waters up to 25mtr and as I’ve built this experience over time, I have written about it and published those works. In addition I am a Chartered Manager with CILT, a member of the institute of Engineering & Technology, a Fellow of the Institute of Leadership & Management and a Fellow of the Royal Geographical Society. I help people fulfill their goals in the Mountains (Worldwide), Scuba Diving (Worldwide), provide location support worldwide for the media and assist with technical and safety support whenever requested. For a full picture of me please check out my linkedin profile -

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