The Black Diamond Vapor Helmet is the lightest and most breathable helmet in Black Diamond’s line and is only an ounce heavier than the Petzl Sirocco that I reviewed here. A sheet of Kevlar and a series of carbon rods in between co-molded EPS foam provides the bulk of impact protection along with a thin but full polycarbonate shell. I’ve been testing this helmet out while climbing and guiding for the last three months and I’m ready to share my opinions on it! As normal I’ll start with the most noticeable features and work towards the minutiae.
Weight
Black Diamond lists the weight of the M/L size at 199 grams, or 7 ounces. My home scale measured 206 grams, or 7 3/8 ounces. For comparison my size 2 Sirocco weighed in on the same scale at 174 grams, or 6 1/8 ounces. While the listed weight seemed a slight bit low it truly weighs only an ounce more than the bar-setting Petzl Sirocco. This ultra-light weight is a boon for long approaches and descents and increases long-term comfort. You truly can forget you have your helmet on when wearing lids like this!
Breath-ability
Twenty one geometric and well placed holes offer excellent airflow through the helmet making this one of the best hot weather options out there. Furthermore I tested the “Blizzard” color which is basically white and reflective and I found the helmet to be as cool as is possible even on sweltering August days.
Fit/Comfort
The M/L size is listed to fit a head circumference of 58-63 cm (23-25 in). My head measures about 60 cm (23.5 inches). That said I found the helmet to run a little small. It fit my shaved head well but was almost maxed out (I do have a large head). I have just enough room for a thin hat liner for cold weather climbing. Removable and breathable helmet pads are soft on the skin and can be removed for washing. The Y-harness strap is not adjustable but fell perfectly around my ears. The feather like weight and high degree of breath-ability really do make this one of the most comfortable helmets I have ever tested.
Features
Other than the weight and breath-ability the only other feature to talk about is the headlamp clips, which oddly are removable. Black Diamond suggests that removing them may make the helmet less likely to get snagged on slings, etc. but I’d suggest just leaving them on. They didn’t get caught on anything while I was testing. The helmet also has a nice low profile while providing great coverage on the back and sides.
Durability
It’s hard to accurately rate long term durability after just three months. I have friends who have climbed regularly in theirs for over a year. The thin polycarbonate shell does not resist small dents and dings with regular use. Black Diamond advises against packing this helmet inside your pack. I packed mine in the top of my pack like I usually do if I don’t have a full load and had no issues (but I remember it is in there and don’t sit on my pack when it is in there). If you strap it on the outside of your pack I would suggest you don’t just drop your pack on the ground when you reach the crag. I wouldn’t say you need to “baby” this helmet but if you want something that can take more abuse check out the Black Diamond Half Dome or Petzl Boreo that I reviewed here.
Summary
This is a specialist helmet. It’s a bit pricey, but the weight savings and breath-ability can easily justify the price. I’ve heard that cycling helmets made with a similar construction can go for 2 to 3 times more! The best uses for this helmet would be alpine climbing and long multi-pitch trad climbing. I’d chose something longer lasting for sport climbing where a couple ounces more can buy you a lot more durability. If weight and long term comfort in warm weather are a priority the Black Diamond Vapor is a great pick!
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Northeast Alpine Start 
So, you have BD Vapor and Petzl Sirocco helmets sitting in your gear room – which one are you going to choose if you are heading out for a day of rock or ice climbing in New England?
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Astute question! My Sirocco gives me a little more room for a thicker hat so I’d lean that way for ice. For rock they are pretty equal in my opinion, with the Vapor being slightly more breath-able. So basically hot weather = Vapor, ice = Sirocco
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What’s different about the Vapor? Abundant venting holes, mostly in the sides and back, allow for much more airflow than solid helmets. Kevlar and carbon rods inside co-molded EPS foam with a polycarbonate shell keep the weight low. The ratcheting suspension adjusts the fit instantly and tucks inside the helmet, storing compactly in my pack. Removable clips hold a headlamp securely. Note, though, that Black Diamond cautions against using the Vapor in a situation with high rockfall potential. Stick to sport and trad cragging with it.
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What helmet is more durable? The sirocco or the vapor? I am loving the fit of the Vapor but scared that i break it so fast. So not sure what helmet i should take. Also have u tryed the Mammut Sender Helmet? How is the durabilty on that one?
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