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Petzl Sirocco Helmet

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9 Reviews


The new standard in lightweight head protection.

Whether you're tackling heady trad routes or you have aspirations in the big mountains, climbing with a helmet isn't just a good idea, it's a necessity. With the ultralight Petzl Sirocco Helmet, you get the required head protection at under 6 ounces, less than the weight of two quickdraws. The adjustment system gives you a perfect fit and the patented magnetic buckle allows you to secure the chin strap with one hand.

  • Expanded polypropylene shell provides high impact resistance while keeping the weight under 6oz
  • Size 1 head circumference is for 48-56cm, size 2 head circumference is for 53-61cm
  • Textile adjustment system adapts for a perfect fit
  • Fully ventilated shell keeps you cool and comfortable
  • Inner comfort foam is lined with absorbent fabric and is removable and washable
  • Patented Magnetic buckle allows you to secure the chin strap with one hand
  • Two hooks and rear elastic allow you to attach a headlamp
  • Two lateral holes provide a place to attach the Petzl Vizion visor (visor sold separately)
  • Item #PTZ0351

Tech Specs

polypropylene (EPP)
Adjustable Vents
Fit Adjustment
textile adjustment system
CE EN 12492 (climbing)
Claimed Weight
(size 1) 5.1 oz, (size 2) 5.8 oz
Recommended Use
climbing, trad, mountaineering
Manufacturer Warranty
3 years

Tech Specs

  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

Like nothing at all

  • Familiarity: I've used it several times

This helmet is insanely light and breathable. It literally feels like you're not wearing a helmet at all. Don't worry though, it looks absolutely ridiculous, so all your buddies will remind you that you're wearing it as you hear them snickering at you behind your back.

This is a great helmet that you can bring along with you on long adventures in the mountains when you need a helmet for parts of the day, but not all of it, and don't want to carry something that will weigh you down.

felt like I was wearing nothing!!

  • Familiarity: I've used it once or twice and have initial impressions

I like the hard shell dome models better it makes me feel safer, but that's not what this is really meant for. but the more current model fixed that and added a bit of plastic exterior on top.

Lite Helmet

  • Familiarity: I've used it once or twice and have initial impressions

This is a super light helmet.
It is flexible.
The straps adjust nicely.
I like the magnetic chin latch.

It prevented small rocks falling from damaging my head.
The rocks scratched the helmet because it's made of a pretty soft foam exterior.

I think it's ugly but that's much more a personal opinion.

The new one coming out this summer is super dope!


  • Familiarity: I've used it once or twice and have initial impressions

Well. Just like everyone else on here.. this helmet is amazing.

If you are looking for a super super light helmet this is the one. Really can't say anything bad about it.. If i had to say something it would be that the straps are super thin. However what do you expect when you are getting such a super light helmet.

This is super comfy and i love the magnetic chin strap.


This is the best helmet.

  • Familiarity: I've put it through the wringer

This is the best helmet. It is also the ugliest!

I've owned it for about 1.5 years. I bought it after taking an inverted fall that cracked my old hardshell/foam combo helmet right down the back. I was scared at how little protection my helmet had against that kind of fall and I wanted something better.

- This helmet is SO LIGHT. I forget I am wearing it all the time, wear it the whole descent, and get back in the car and start driving before I notice it bumping the car ceiling. It's also very breathable...for a helmet.
- Initially I heard a lot of concern about the durability of this helmet, but I have no complaints. I don't particularly baby it, but I do make sure that it's not underneath a bunch of heavy stuff when I pack it in the car, and I always pack it on the very top in my pack, dome up, to prevent it from being squashed off-axis. That's it. It's got some scrapes and scratches but it'll easily last several years more.
- It provides the excellent side and rear protection for your head, and its elastic foam material doesn't break on impact: it cushions and bounces back.
- I really like the magnetic buckle, which you can do one handed when you remember it's not buckled fifteen feet off the ground.
- As it gets dirty the orange color is a little less heinous. Plus, once it's on your head, you can't see how ugly it is! Unless your partner buys one too...

- The straps are kinda thin and prone to twisting.
- The buckle can pick up magnetic dust and sometimes needs to be cleaned (quick brush of the thumb) to buckle.
- Ugly.

I paid full price for this helmet and I definitely feel like it was worth it---the comfort and protection it provides are the best out there right now. I'll buy one again even if they only ever make it in orange.

This is the best helmet.

WOW...light. WOW...tough!

  • Familiarity: I've put it through the wringer

I have taken this helmet on multiple international expeditions: A worry for me when I'm packing for a big trip is weight and I'll cut corners wherever I can; but when it comes to lightweight helmets, it is generally just not worth bringing anything other than a helmet made with an ABS shell. If the plane ride doesn't destroy them, the porters/approach will.

Not the case with this helmet!! It is tougher than woodpecker lips!!

Very light. I hardly notice it unless I'm in a chimney or a cramped space.

The color is bright, but in the mountains I appreciate this aspect greatly.

Holds a headlamp very well.

Plenty of room for a warm cap underneath.

It breaths OK, hard to get a helmet with good coverage to breath very good though.

The magnetic strap clip is very cool, it has a tendency to collect some debris, but I just wipe it off occasionally.

The EPP also holds custom artwork very well...see pic (art by Jeremy Collins).

If you want a light, durable helmet, this is the best one made, bar none!

WOW...light. WOW...tough!

Ugly as a orange rock

  • Familiarity: I've put it through the wringer

but tougher than an old nail. This one is not fragile. And it offers a huge amount of head protection. Stand on it, stuff it in the pack and sit on it. No worries. Liekly the technology everyone will eventually be using, If you cna deal with the bright orange color the Sirocco will serve you well and help keep your head in one piece hopefully.

A real helmet at an unreal weight

  • Familiarity: I've used it once or twice and have initial impressions

The 150/165g spec weights for sz1/2 (respectively) are spot-on (though the listing here is slightly off for sz1), making even my CAMP Speed helmet seem . . . heavy?

First, the not-so-good:

1. Sizing is too big. My head circumference =57.2cm, which matches up well with specs for my various ski/bike/climb helmets, but the 53-61 sz2 sides stick out too much. The sz1 48-56cm just barely fits.

2. Appearance is so bad that it's almost comically good.

3. The straps are so narrow that they can twist when putting on the helmet, but they're so thin that still super comfy.

4. Magnet to enhance one-handed connection of the chin strap is clever, but can allow the strap to be closed insecurely with only one of the two side clips engaged. So just need to remember to check that both sides of the clips are engaged.

5. CAMP Speed comes down a little bit more around the sides for more side impact protection.

6. Vents are ample on the sides, but realistically no climbing helmet will ever vent well at ascent speeds, since it has to be solid up on top to be certified.

Now the (very very) good:

1. Weight. Yes, already mentioned, but so amazing it merits another mention.

2. Durability. As demonstrated by a Petzl rep, you can step on this helmet, smush it, etc., w/o worrying about damage to the thin plastic exterior ... because there is no thin plastic exterior, just a single piece of foam.

3. Can also attach a Petzl Vizion visor.

4. Strap system is brilliant, achieving the same adjustable and snug front<>back fit that is usually achieved by much more bulky adjustment systems/knobs/etc. at the back of the head. In addition to weight savings, less interference with wearing a sun cap underneath or sunglasses retainer.

5. Headlamp clip in back is minimalistic (of course) yet effective, and even securely holds a wide ski goggle strap.

A follow-up on my own review, specifically point 6, on venting: I'm still not sure how much difference the vents will make at ascent speeds, but for skiing descents, wow, this helmet sure cools off quickly! Too quickly actually on really cold days, with only a headband underneath, as I discovered during a rando race. For a post-race relay, I covered up the front/forehead vents w/ tape, and the side vents still let in lots of air on a (very fast) descent. So, definitely both a plus & minus there.

Hi Jonathan, very helpful review! I'm about to order this and I was wondering whether I would fit size1. What do you mean by "barely fits", do you use size one? (can you put something else beneath it like a buff or thin hat maybe?) I'm a bit smaller than you at 56.5. Thanks!