Choosing Your First Climbing Helmet: Hard Shell, Foam Shell or Hybrid, How to Fit It, and 6 Current Models Compared

🌏 中文版

Nobody wears a helmet in the gym. The first time you go to an outdoor crag with friends, you notice everyone has one on, including the person belaying at the bottom. You ask which one to buy: someone says the white Petzl, someone else says lighter is better, and the shop has them from under 1,000 to nearly 6,000 Taiwan dollars.

This is post 6 in the Climbing Gear series. Post 0 explained that helmets are personal protective equipment, with standards and labels; the UIAA's buying advice singles out helmets (and harnesses): how well they fit affects how well they protect you, and sizing varies a lot between brands, so check the manufacturer's size chart. This post answers two questions: which construction suits the terrain you're heading for, and which current helmets are worth trying on first. Why belayers outdoors wear helmets too is covered, with accident reports, in outdoor belaying; harnesses are in post 3. By the end you should know which type of helmet you want and how to try one on in a shop.

Four criteria

1. Construction: hard shell, foam shell, hybrid

Petzl Taiwan's 2026 helmet guide (in Chinese) sorts helmets into three types by material:

REI's helmet guide uses only two types: hardshell (very hard outer shell, strap suspension, thin foam liner; cheap, durable, long-lasting) and foam shell (thick foam under a thin shell that deforms to absorb an impact; light, well ventilated, more expensive). Petzl Taiwan's foam shell and hybrid both count as foam shells in REI's scheme.

REI also warns that brands use different names, so judge by construction. Petzl itself is an example: the Taiwan guide calls the Boreo a hard shell, while Petzl's US site describes its ABS shell with dual foam liner as "hybrid construction".

Petzl Taiwan adds that with certification, both materials can absorb a single impact; the difference is what happens afterwards. Foam absorbs energy by deforming and must be retired once deformed; ABS copes better with repeated knocks and wear.

Which to choose? The two sources don't quite agree:

• DAV's 2010 article on gear lifetime (in German): hardshells generally cope better with rockfall and are clearly tougher under multiple impacts (tumbling down broken ground); light foam helmets give the best energy absorption in a single impact. So DAV suggests foam rather for alpine sport climbing, hardshell for classic alpine terrain.
• REI: for multi-pitch trad and mountaineering, where you carry a lot and wear the helmet for hours, low weight and ventilation matter, so consider foam; for cool-weather single-pitch sport, where you can take the helmet off between climbs, you can choose a cheaper, durable hardshell.

They weigh different things: DAV the kind of impact, REI the burden of wearing it all day. DAV is writing about alpine settings; REI singles out single-pitch sport climbing on its own. Both are laid out here so you can match each to the terrain you're heading for.

In this beginner's guide to sport climbing that HowNOT2 shot with Hard Is Easy, helmets come up at 10:07. HowNOT2's Ryan wears an all-plastic hard shell; Ben from Hard Is Easy wears one that is half foam with a more durable shell over the top. Ben's short version: for sport climbing, go for a hybrid with more foam and more ventilation, because you get hot when you climb, and sport-oriented helmets are lighter, so you put one on and forget about it. That is Ben's own advice, not a finding that overrides DAV or REI, and he is talking about sport climbing, not alpine rockfall. The video says no one sponsors the channel and that viewers support it by buying gear from HowNOT2's site, which means HowNOT2 sells gear itself.

Something you can do tonight: write down where you'll most likely wear a helmet over the next year: single-pitch crags, multi-pitch, or also canyoning and mountaineering. For single-pitch and lots of knocks, look at hard shells first; for wearing it all day on long routes, look at foam shells.

2. Side protection: read what the manufacturer says

A helmet isn't only for rocks falling on top of your head. In a tumbling fall, or swinging sideways into a ledge, it's the side that gets hit. In the same video, from 11:55, Ben says that if you flip upside down on a climb you will hit your head, and you want it to be your helmet that hits, not your head; he has watched plenty of top climbers who skip helmets flip over too.

EN 12492 already tests front, side and rear absorption (see the fold-out at the end of this section), just from a lower drop height than the top. Several brands add their own side-protection labels. Since 2020 every Petzl sport helmet carries TOP AND SIDE PROTECTION, which Petzl says guarantees side, front and rear protection beyond what the EN/UIAA standard requires; Black Diamond says the Capitan E and Vision meet "the proposed UIAA increased side and back protection requirements". These are manufacturer claims, tested by methods the manufacturers set.

The comparison table below copies what each manufacturer says about side protection, and says "not stated" where it says nothing.

Something you can do tonight: turn your helmet (or the one in the shop) over and see whether the foam reaches the sides and the back of the head. A helmet with a single block of foam on top gives less protection in a side impact.

3. Head size and head shape: always try it on

Petzl Taiwan measures head circumference as a horizontal loop just above the forehead. Most helmets come in two sizes; leave a little room so you can wear a thin hat underneath in the cold.

The right circumference isn't enough. Petzl Taiwan also notes that some helmets are longer and narrower, others rounder, so it's best to try one on before your first purchase. OutdoorGearLab is more blunt: foam helmets are molded to a fixed shape, and the headband adjusts size, not shape.

This matters especially for Asian readers. English-language reviews don't discuss Asian head shapes directly; what we found are opinions in two Japanese videos, personal views rather than measurements:

• In a comparison filmed at a mountaineering shop by こうたろチャンネル (from 24:00), the staff member says most overseas brands are designed around European and American head shapes, Japanese heads are rounder, and he points to Grivel's wider "Japan fit" as an example.
• Hiking blogger ヤマノ (from 3:00) says Western brands tend to be longer front to back and often don't suit Japanese heads, so don't skip trying them on.

Taiwanese readers' heads aren't necessarily the same as Japanese heads, so take these two as a reminder: the same M/L can feel very different between brands, so try several.

This video is in Japanese with Japanese auto-captions. It was filmed in cooperation with the shop, with shop links in the description; it doesn't say whether it was sponsored.

Something you can do tonight: measure around your head just above the forehead with a soft tape and note the centimetres. That's the number to check against the head-size column in the table below.

4. Fitting: no wobble when you shake your head, no slack in the chin strap

REI's steps:

1. Put the helmet on squarely, with the front rim straight across your forehead, not tipped back.
2. Adjust it, then shake your head side to side and tilt it back slightly. The helmet should stay snug and not move.
3. Buckle the chin strap with no slack. The front and rear straps should form a "Y" around each ear.

REI also suggests trying the adjustment system to see how intuitive it is. In the cold you may wear a hat under it and need to readjust.

WeighMyRack's video on the 2024 Sirocco shows an adjustment order from 2:30 that pairs well with REI's steps:

• Back first: set the height of the rear cradle below the bump at the back of your skull, then tighten.
• Then the Y straps by the ears: not pressing on the ear, not below the jawline.
• Chin strap last: not loose, but loose enough to talk and breathe.

The presenter is from Petzl, so this is a brand demonstration; the price he quotes differs from the current list price, which takes precedence.

At the end of ヤマノ's video (from 11:15) is a try-on checklist: no slipping front, back or sideways; no pain at the temples or above the ears; the buckles by the ears don't press; the chin strap is comfortable when done up; no clash with a hat; a headlamp fits. If you'll wear a hat under it in winter, bring the hat when you try helmets on. That video's description contains Amazon affiliate links.

Something you can do tonight: if you own a helmet, run through REI's three steps, especially the head shake and the chin strap. Plenty of chin straps are loose.

6 current helmets compared

Only models on sale on the manufacturer's site on 2026-10-24 and mentioned by at least one review roundup or media review. Prices are that day's list prices on the manufacturer's US site, with Taiwan prices where there's a Taiwan official site; weights and head sizes come from the manufacturer. Types follow Petzl Taiwan's three-way split; for non-Petzl models we matched them using the construction the manufacturer describes. "Good for / drawbacks" is inferred from specs and written reviews, with sources in each cell.

Things to watch when reading the specs:

• The Meteor was redesigned in 2026. Use the head sizes and weights in the table, from Petzl's page. Switchback's roundup still calls it the first CE-certified ski-touring helmet; that was the old version, and the new page states it does not meet EN 18100:2024. Petzl Taiwan lists the previous version (225/240 g, head sizes 48–58/53–61 cm), so check which version you're getting if you buy in Taiwan.
• Mammut's two sites disagree on the Crag Sender's weight. The table uses the US site's 199/219 g; Mammut Taiwan lists 210/220 g.
• MIPS is a manufacturer claim. BD says the low-friction layer is intended to reduce rotational forces that can cause concussions; OutdoorGearLab also says "reportedly".

Three more that roundups often mention, covered in one line each:

• Mammut Wall Rider 2.0: a 180/200 g hybrid that Climbing.com rates for long days on big walls; we found no Taiwan retailer, and Mammut's page lists no certification, so it isn't in the main table.
• Edelrid SALATHE: an EPP core with a partial ABS shell over the top and front; Switchback says it may offer the best combination of light weight and durability, but we found no Taiwan retailer.
• Black Diamond Half Dome: one of the cheapest hard shells (USD 69.95), useful as a baseline; but Climbing.com's testers complained about fit and padding, and Switchback dropped it for being heavier and less durable than the Boreo.

In Taiwan, Petzl Taiwan's official site lists the Boreo, Borea, Meteor and Sirocco; BD Taiwan lists the Capitan E and Vision; and Mammut Taiwan lists the Crag Sender.

Test and review videos

Below are five videos from 2024 or later that discuss specific models; we checked the captions for each. Some helmets were sent by the brand, and some presenters work for a shop or a brand; that's noted for each.

UKClimbing's Rob Greenwood and Tim climb trad in a BD Capitan and the ultralight Vapor, asking how to choose between cheap and durable versus light and airy. From 2:30 they say the Capitan will last longer, and from 3:30 that the Vapor needs careful packing, not at the bottom of a rucksack, while the Capitan can take rough treatment; from 4:30 Rob says the Capitan probably suits 90 to 95% of climbers. From 7:00 he actually prefers the Capitan's rear cradle, as the thin cords by the ears on the Vapor rubbed. The description doesn't say where the helmets came from.

In this Japanese video, the hiking couple behind しのびや・おすぎ visit シャモニ, a climbing and mountaineering shop in Yokkaichi, Mie, and ask a staff member to walk them through a first helmet. It has Japanese auto-captions. From 10:33 he says the BD Vision is light and solidly built to the standard, and he recommends it, though it isn't cheap. From 11:46 he turns to the Capitan: it's closer to a hard shell, so if the Vision doesn't feel reassuring enough and you want more strength, the Capitan is an option, but its larger shell makes it heavier, and it costs a bit less than the Vision. In between, from 10:58, he points out that most people fasten the chin strap first, when you should tighten the back first and then the chin strap for a better fit. The description links to the shop and doesn't say whether the video is sponsored.

Mountain guide Ryan Tilley wore the new Meteor at work for a summer; this is his long-term take. He says Petzl sent him the helmet.

• From 3:45, retirement: check the sides of a light helmet first. The Sirocco he retired had four dents and a crack on one side.
• Lifespan: with weekend use he estimates three to five years for this kind of helmet, not as long as an all-plastic Half Dome.
• From 6:00, rotating: the Meteor lives in his crag pack and the Sirocco goes alpine, so both last longer.
• From 12:00, sizing: in the same M/L, the Meteor feels tighter than the Sirocco. He has heard from plenty of people who can't find a Petzl that fits, and concludes that the best helmet is the one that fits your head.

Near the start (from 0:45) he says climbing helmets are only certified for the top and that rocks don't hit you from the side. That doesn't match the EN 12492 pictorial above: the standard does test the front, sides and back. So start at 3:45.

Kellen Erickson on the 2024 Sirocco after ice climbing, dry tooling and rock climbing in it. From 2:16 he says he expected the bigger field of view from the shorter front brim to be a marketing line, and on the first day out found it a "game changer"; from 3:20 he notes that the two front vent holes are gone, so bits of ice no longer drop in and melt. From 4:00 he says the rear is a simple webbing cradle that long hair doesn't get caught in the way it does with dial systems, which is why he chose the Sirocco. From 4:41 he covers the new plastic buckle: it's small and took some learning with gloves, but the old magnetic buckle caught strands of hair and stopped closing when dirty, so he's fine with the change. From 7:41 his only complaint is that the headlamp clips catch on his hood more than on the old version. Neither the description nor the video says how he got the helmet.

WeighMyRack lines up five of the lightest helmets (the Sirocco shown is the pre-2024 version). From 1:00 he explains why the lightest group all use EPP: it recovers better than EPS after being pressed. From 3:00 he weighs them: some come in heavier than claimed, some lighter, and he says batch variation is normal, not a sign of bad faith. He ends by saying he wore a Sirocco for years but now reaches for another one that fits his head better, so try on as many as you can. The description has WeighMyRack price-comparison links without stating whether they're affiliate links.

Three more are embedded in the criteria above: HowNOT2 and Hard Is Easy on choosing a sport-climbing helmet, WeighMyRack's Sirocco fitting steps (presented by Petzl), and the head-shape section from こうたろチャンネル.

Among Chinese-language videos, we found no Taiwanese creator from 2024 or later comparing specific helmet models.

Choosing for three situations

Your first helmet, mostly single-pitch at the crag

• Choose a hard shell: the Petzl Boreo or BD Capitan E. You can take it off between climbs, so weight matters less than toughness.
• Try both brands and pick the one that doesn't move when you shake your head and doesn't press by your ears.

Starting multi-pitch, or wearing it for long hours

• Look at foam shells: the Petzl Meteor or Mammut Crag Sender, and the BD Vision if the budget allows.
• Don't pack heavy things on top of the helmet; pressed foam keeps the dent.
• If you'll wear a beanie or a hood under it, bring it when trying helmets on; you may need the larger size.

Already committed to long routes and alpine terrain

• Now a hybrid like the Petzl Sirocco is worth considering: it's the lightest, and the easiest to crush.
• You could do what Ryan Tilley does: a durable helmet for the crag, a light one for the mountains, and rotate.

Inspection and retirement

• Check the sides: on light helmets, dents often show up on the sides. Ryan Tilley checks the sides first when retiring a helmet; dents or cracks mean it goes.
• Deformed foam means retirement: Petzl Taiwan says foam absorbs impact by deforming, absorbs less once deformed, and must then be retired.
• Stickers: the shop staff in the こうたろチャンネル video warn that a sticker can hide damage.

For the full inspection and retirement rules, see the last post in this series, How to Inspect and Retire Climbing Gear.

Practice: four scenarios

Answers are under each question. Think first, then look.

1. You put on a helmet. The front rim sits high above your forehead, the chin strap is loose, and the helmet wobbles when you shake your head.

2. You're heading out for your first day of single-pitch at the crag, and a friend says the Sirocco is the lightest and best, so just buy that.

3. You find a well-reviewed helmet online whose size range includes your head circumference, and you want to order it straight away.

4. A friend offers you the foam helmet they've used for several years. There are a few dents on the side, and they say "the top is fine, it's still good".

Next

With a helmet, you're ready for outdoor sport climbing. The next thing to buy hangs on your harness and goes into every bolt on the way up: post 7: quickdraws.

Further viewing: gear-testing and instruction channels

The helmet video embedded in the criteria section was shot by Hard Is Easy and HowNOT2 together. If you want to dig further, start with Hard Is Easy, and keep its limits in mind.

• Hard Is Easy: run solo by a climber who signs as Ben, a former software developer. After watching a hard catch slam a climber into the rock in Tonsai, Thailand, he designed his first experiment; the channel now focuses on experiments and physics explanations about belaying, ropes, carabiners and belay devices, with several recent episodes filmed in Mammut's lab. Limits: most experiments are his own design, not EN/UIAA standard tests.

HowNOT2, the other testing channel this series often uses, is introduced in post 3: harnesses.

References

Manufacturer product pages and prices (checked 2026-10-24) are linked in the table above.

• UIAA Advice: Ten things to consider when buying climbing gear (UIAA, February 2026)
• 頂上防禦力提升指南：如何挑選戶外頭盔? (Petzl Taiwan, 2026-07-01, in Chinese)
• How to Choose a Climbing Helmet (REI Expert Advice)
• Lebensdauer von Alpinausrüstung (DAV Panorama 5/2010)
• EN 12492/UIAA 106 Helmets pictorial (UIAA, 2020)
• Enhanced Protection Now Comes Standard in All Petzl Sport Helmets (Petzl, 2020-01-14)
• The Best Climbing Helmets (OutdoorGearLab, 2025-09-10)
• Best Climbing Helmets (Climbing.com, 2026-10-08)
• Best Climbing Helmets (Switchback Travel, 2026-09-01)
• Best Climbing Helmets (Treeline Review, 2026-09-17)
• Mammut Crag Sender Helmet (UKClimbing, 2024-12-15)
• Black Diamond Vapor & Capitan Helmets (UKHillwalking, 2024-05-14)
• Intro to Sport Climbing ft. Hard is Easy (HowNOT2, 2025-01-09)
• 登山用ヘルメット最強決定戦 (ヤマノの未熟登山, 2026-06-26)
• Outdoor belaying: from the gym to the crag
• Rent or buy first: climbing gear buying order and labels