Gear for the Mont Blanc Ascent

Boots are rated B2 (semi-rigid, semi-automatic crampons) or B3 (fully rigid, automatic crampons). For Mont Blanc, a fully rigid sole — with a fiberglass or carbon shank — ensures the crampon undergoes no mechanical flex under load, flex that would cause it to eject in the middle of an ice slope. Thermal insulation must be rated for negative temperatures of −10°C to −20°C (Gore-Tex Insulated Comfort lining or equivalent).

Aluminum should be avoided: it wears out almost instantly against the granite of the Goûter arête. Only thermally treated chrome-molybdenum steel withstands the alternating rock and ice of the normal route. The reference configuration is a 12-point model with two horizontal front points, designed to bite into hard ice.

The anti-balling system — a flexible, hydrophobic polymer plate fitted under the crampon — repels the warm, wet snow that builds up under the boot. Without it, snow forms a compact "clog" that isolates the steel points from the icy surface: the boot turns into a smooth skate, a direct cause of slips on steep slopes.

Ice axe shafts meet two standards: Type B (Basic, moderate strength, suited to walking) and Type T (Technical, high strength, for anchoring and pulling). A classic, lightweight Type B ice axe with a straight or slightly curved shaft is more than enough for Mont Blanc's normal route.

Length is calculated by holding the axe by the head with the arm extended along the body: the point should just reach the outer ankle bone. An axe that's too short strains the back on the climb; too long, it prevents effective arm anchoring. In case of a slip, the forged steel blade's geometry must allow the self-arrest maneuver — the axe held against the chest, point dug into the snow to stop the fall before it accelerates.

The helmet (EN 12492 standard) dissipates impact energy through deformation of its expanded polystyrene (EPS) shell — direct protection against rockfall in the Grand Couloir. The harness must be a ski-touring/mountaineering type, opening fully via quick buckles at the thighs, so it can be put on without removing crampons or losing ground contact. The rope, finally, must have a hydrophobic treatment (UIAA Water Repellent standard): an untreated rope can soak up water, freeze and gain up to 40% in weight, losing part of its dynamic shock-absorption capacity in the event of a crevasse fall.

Pair 1 — liner gloves for handling: silk or tight stretch fibers. Allow tying a knot or handling a metal carabiner at −10°C without skin directly touching the metal, avoiding frost burns.

Pair 2 — main mountaineering gloves: waterproof-breathable membrane, moderate thermal insulation (Thinsulate or wool), robust leather palm to withstand rope friction and ice axe grip.

Pair 3 — extreme-cold emergency mittens: thick insulation, worn over the first two pairs if the wind picks up. Fingers grouped together in a mitten maximize thermal retention compared to fingers separated in a glove.

The atmosphere thins with altitude and filters less UV — the UV index increases by about 10 to 12% for every 1,000 m. Snow, meanwhile, reflects 80 to 85% of direct solar radiation (albedo effect). Category 3 lenses, even large ones, are insufficient: they expose you to snow blindness (photokeratitis), an extremely painful UV burn of the cornea that causes temporary blindness for about 48 hours.

Category 4 (light transmission of 3 to 8% maximum) is the required standard, with removable side shields — leather or polymer — to block oblique rays and peripheral glare that ordinary lenses let through.

Tall expedition socks in merino wool with differentiated knit zones (cushioning loops on the shin, against pressure from the boot's rigid tongue; heel and toe reinforcement in polyamide against mechanical wear) limit compression points over 8 to 10 hours of continuous walking.

A profiled beanie, without a pompom, fits under the helmet shell without creating a painful pressure point. A balaclava or thermal neck gaiter protects the airways from the freezing air, which irritates the bronchi above 4,500 m.

Water bladder systems (Camelbak-type) should be avoided in winter or high-altitude mountaineering. Even protected inside the pack, the flexible tube exposed to open air freezes within minutes at the first negative temperatures, permanently blocking the valve. A rigid aluminum bottle in an insulating neoprene sleeve, or a double-walled stainless steel thermos flask containing a hot, sweet drink to break the body's thermal lethargy during breaks, is a better option.

An optimized-system stove (closed, wind-protected burner) offers markedly better thermal efficiency than a classic burner and lets you melt clean snow to produce drinking water. Pure snowmelt, however, is essentially distilled water, devoid of mineral salts: consuming large amounts without remineralizing disrupts the body's osmotic balance (risk of hyponatremia), causing gastric trouble and muscle fatigue. Systematically add electrolyte tablets, a tea bag or salted broth.

A "couloir" profile — narrow, without protruding side pockets — avoids snagging cables or rock in narrow passages and limits imbalance on technical terrain. Target loaded pack weight: 8 to 10 kg maximum. Every extra kilo disproportionately increases oxygen consumption and heart rate in a state of altitude hypoxia.

At the top of the high-end segment, Arc'teryx (Canada) remains the benchmark: its Alpha AR or SV jackets in Gore-Tex Pro are very common among guides and demanding clients, at a high price. Norrøna (Norway, Trollveggen range) and Patagonia (United States, Down Sweater jackets, Triolet shells) also occupy this technical segment, the latter especially among a clientele sensitive to the brand's environmental impact.

On the massif's historic pillars side, Millet (France) has been the official supplier of the Compagnie des Guides de Chamonix since 2010, its Trilogy range designed with field-testing guides. Mammut (Switzerland, Eiger Extreme range) and Rab (United Kingdom, down-jacket specialist) round out this group, alongside Mountain Hardwear (United States), present on expeditions. Cimalp (France, Drôme, founded in 1964) relies on its signature Ultrashell® membrane — patented in 2012, rated 20,000 Schmerber / 80,000 g/m²/24h and corroborated by more than ten independent tests across 3 countries — worn in particular by two PGHM Chamonix rescuers, Fred Souchon and Bastien Fleury, personal ambassadors for the brand.

On the accessible segment, Salewa (Italy, Dolomites) and Decathlon's Forclaz/Simond offering (France) are widely represented among self-guided mountaineers for their value for money.

Two Italian brands largely dominate the crampon-compatible rigid boot market: La Sportiva, founded in 1928 in Ziano di Fiemme (Trentino), whose Nepal series is one of the most widespread on the massif, and its modern Aequilibrium range with integrated gaiter; and Scarpa (Italy), with its Mont Blanc Pro GTX range and its technical Ribelle/Phantom series — often chosen by wide feet, less comfortable in La Sportiva's narrow last.

As an alternative, Simond (France, Alpinism Heavy model) offers B3 rigidity at an accessible price, Millet (Elevation, Grepon ranges) offers lighter models, and Meindl / Lowa (Germany) remain references in traditional heavy leather.

Petzl (France, Isère) is the reference brand for technical gear: Summit / Summit Evo ice axes for walking, Quark for more committing routes such as the 3 Monts; Vasak and Sarken crampons. Grivel (Italy, Courmayeur) remains identifiable by its bright yellow tones, with the G12 crampon, direct heir to the 12-point crampon invented in 1929 by Laurent Grivel — son of Italian blacksmith Henry Grivel, who made the very first crampon (10 points) in 1908, designed by British mountaineer Oscar Eckenstein. Black Diamond (United States) completes this trio with its Raven ice axes and Serac/Sabretooth crampons.

On the accessible segment, Simond equips a significant share of self-guided mountaineers (Oisans ice axe, Makalu crampons). Blue Ice (France, Chamonix) targets the ultra-light segment favored by "fast and light" rope teams, and Camp / Cassin (Italy) are references for ice screws, carabiners and lightweight crampons.

Petzl largely dominates this segment: the Boreo (ABS, robust) is the standard rental model in the valley, the Sirocco (expanded polystyrene, ultra-light) is preferred by regular practitioners. Black Diamond (Half Dome, Vision), Simond (Sprint, Alpinism, affordable) and Mammut (Wall Rider) share the rest of the market.