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Lazer Cosmo helmet with Aeroshell



Great dual-use lightweight helmet that swaps from road use to aero with removable shell, but on the pricey side

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Lazer Cosmo helmet with Aeroshell is a road helmet that comes with a cover – the Aeroshell in the name – to improve aerodynamics when you don't need as much ventilation or are prepared to sacrifice ventilation for a tiny bit more speed. It does a great job both with and without the cover, and with the shell on it will keep the rain off your head too.

If you do a little bit of time trialling but can't really justify buying a dedicated time trial helmet helmet, then this could be the answer. Lazer bill the Cosmo as their 'most advanced road helmet to date', and as you'd expect from that designation, it's expensive.

Lazer Cosmo helmet with Aeroshell - aeroshell on.jpg

The fit and comfort of the Lazer Cosmo helmet is much improved from Lazer's cheaper models, thanks to the upgraded extra light version of the Rollsys cradle. This is the wire system that secures the helmet on your head and is adjusted via a top mounted screw. It is a much nicer fit, with soft, lightweight straps.

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I have a small head and often have helmets at their tightest setting. On the Lazer I find the screw for holding it tight loosens sometimes. If I compare it to the Kask Mojito with its dial at the back, the Kask mechanism feels more secure to me, but riders with larger heads will probably be fine.

Lazer Cosmo helmet with Aeroshell - aeroshell removal.jpg

There is a little bit of adjustment to be had by lowering the wire system to fit round the head more at the back, so it doesn't feel like it is perched on your head. It is a small adjustment but quite useful for small heads.

There isn't a lot of padding, but it seems the right amount as the Cosmo is not uncomfortable at all. Less padding also means less sweat getting soaked up and needing to be squeezed out. It comes with spare set of pads in box.

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Ventilation using it as a road helmet was very good. It has deep channels that carry plenty of breeze over your the head. Put the aeroshell on and you lose ventilation. The cover clicks on with no additional fixings and blocks all the inlet vents, leaving just a few open at the back. It gets a bit warm under the shell, but it you are wanting to shave seconds off a 10 miler, then it's probably worth the extra sweat.

Lazer Cosmo helmet with Aeroshell - aeroshell on side.jpg

One of my test days was a 10-hour ride on a warm day, and the Lazer Cosmo performed really well for ventilation and comfort. I really didn't notice it as there were no pressure points. As someone with a small head, finding a helmet which is a comfortable fit is sometimes a challenge. But this helmet passed the test well, especially on a long ride. Right amount of padding, soft comfortable straps which fit well. And it doesn't look like a mushroom on my head as some do.

Overall, a comfortable lightweight helmet with option of click on aeroshell. If you are looking to colour coordinate with your bike there are many different colour shells, and a union jack one.

Lazer Cosmo helmet with Aeroshell - side 2.jpg

Given that it costs £219 and weighs 255g, whether you the Cosmo is for you depends on comfort, and whether the aeroshell is of any use to you. There are lighter helmets at a better price like the Kask Mojito or the Ekoi Corsa Light with shell.

If you need a new helmet and fancy the idea of a few time trials then the dual-use Lazer Cosmo could be a good option.


Great dual-use lightweight helmet that swaps from road use to aero with removable shell, but on the pricey side test report

Make and model: Lazer Cosmo helmet with Aeroshell

Size tested: Small 52-56

Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

The Lazer Cosmo helmet with Aeroshell is a road helmet which can be converted into a race helmet with a removable aeroshell. Or use the shell as a protective shell in winter from wind and rain.

aimed at keen club cyclists, time trials, cyclo-cross looking for a light and fast helmet.

Tell us some more about the technical aspects of the product?

- features new technology such as T-Pro, or temple protection

- Safety is always a priority when designing a new helmet and we identified that one of the weakest points in the skull is around the temple. As a result, the Z1 offers additional coverage at the side of the head by lowering the helmet in that area

- Without adding weight and while ensuring comfort Lazer made an upgraded extra light version of the award winning Rollsys® system, called ARS or Advanced Rollsys System

- Ventilation is a priority to keep the rider, cool, comfortable and prevent any loss in performance through overheating so the Z1 uses deep ventilation channels which draw air through the helmet, while keeping the gap between head and shell to a minimum

Size: Small 52-56 cm, Medium 55-59 cm, Large 58-61 cm

Rate the product for quality of construction:

The helmet construction seems well made and will last.

My only query is the tightening system, so I find it loosens a little sometimes.

Rate the product for performance:

Performance of this helmet is very good. It is light weight and you really don't notice it at all.

Rate the product for durability:

The durability of the helmet its self seems long lasting. My concern would be the thin aeroshell longterm, as it is a thin plastic shell with edges that click onto the helmet. It snaps onto the helmet nice and easily. Not so easy getting it off. and durability of tightening system

Rate the product for weight (if applicable)

It is lightweight and compares well to other similar helmets in its price range

Rate the product for comfort (if applicable)

The fit on the helmet was good meaning it stayed in place, and it was comfortable. There was ossasions which i had to tighten it up during ride.

Good amount of padding.

straps comfortable

Rate the product for value:

It is an expensive helmet compared to others

Tell us how the product performed overall when used for its designed purpose

As a road helmet it performed very well, good ventilation, fit and light weight. With the aeroshell on the ventilation is lost but you gain aerodynamic performance.

Tell us what you particularly liked about the product

The 2 in 1 helmet does appeal, clever design

Tell us what you particularly disliked about the product

The tightening system

Did you enjoy using the product? yes

Would you consider buying the product? maybe

Would you recommend the product to a friend? maybe

Use this box to explain your score

I score this an 7 as it is a very good lightweight helmet with the added feature of the aeroshell. But it is expensive. The tightening system doesn't seem durable

Overall rating: 7/10

About the tester

Age: 36  Height: 168  Weight: 60

I usually ride: specailized dolce  My best bike is:

I've been riding for: Under 5 years  I ride: Most days  I would class myself as: Experienced

I regularly do the following types of riding: touring, club rides, sportives, general fitness riding, mtb,

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