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Giro Aeon helmet



Very good pro-level lid that's light and comfortable

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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Giro's Aeon has been in the range for a few years now, but it's still easily holding its own as a really well ventilated, lightweight race helmet. It replaced the Prolight and Ionos at the top of the Giro pile; the Prolight has since been discontinued and the Ionos moved down to the second tier, £40 cheaper.

With our test model creeping under 200g by three grams, the Aeon is one of the lightest helmets out there. The fact that it's hugely ventilated helps with that; the Aeon features a thermoformed skeleton inside the EPS foam to keep the structure rigid. The shell is bonded in the mould for extra resilience, as you'd expect from most lids these days. The Aeon conforms to European CE standards.

Retention on your bonce is taken care of by Giro's Roc Loc 5 which is a minimal-but-very-effective clicky dial affair with enough up and down adjustment to get it just so on the back of your head.

The lightweight theme is carried on to the webbing straps that are noticeably thinner than usual. They're a bit more flexible as a result, and sit very comfortably against the sides of your head. The strap guides at the side of the helmet have shrunk a bit too, but they're still very usable and you can adjust the length of the front and rear straps for a perfect fit, which isn't possible with some lightweight retention systems.

Once it's on you'd barely know it was there. The 24 vents let masses of air through and the pads, although minimal, are perfectly placed to keep the lid comfy. They're contain silver antibacterial fibres too to keep the whiffs at bay. It feels plenty comfortable with the flexible straps and lightweight retention keeping everything firmly in place. As always, helmet fit is a pretty personal affair but I found the Aeon to be nigh-on perfect for my averagely-shaped bonce.

At a penny under £200 this is at the top end of what you can pay, and with helmets like Giro's own Savant providing much of the performance for a lot less than half of the price, you're properly in the rarified realms of incremental gains here. But it's a very good, very light, pro-level race helmet so if that's your kind of thing, you won't be disappointed with the Aeon.


Very good pro-level lid that's light and comfortable.

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Make and model: Giro Aeon helmet

Size tested: Medium, Fluo Orange

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?


You wanted a lighter helmet, a cooler helmet, a better helmet '' so we created one. Starting with a full roster of our best features, we optimised every component in the Aeon™ including the shape of the helmet itself, reducing weight by 28 percent compared with its predecessor. We also sculpted massive vents with interior channeling for best-in-class cooling power and integrated the adjustability and comfort of Roc Loc® 5, for a luxurious feel with all the performance you need.

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


X-Static® padding

Featherweight webbing with Slimline buckle



In-Mold polycarbonate shell with EPS liner

Thermoformed SL Roll Cage™ reinforcement



Roc Loc® 5



24 Wind Tunnel™ vents with internal channeling



S 20'-21.75' / 51-55cm

M 21.75'-23.25' / 55-59cm

L 23.25'-24.75' / 59-63cm

Sizes Available:

L 59-63CM

M 55-59CM

S 51-55CM

Colours Available:








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

Very well indeed

Tell us what you particularly liked about the product

Fit, weight.

Tell us what you particularly disliked about the product

The fact that you can get Giro's excellent Savant for £140 less.

Did you enjoy using the product? Yes.

Would you consider buying the product? No, I'm more comfortable a few rungs down the helmet ladder.

Would you recommend the product to a friend? Yes, if top-level gear was their thing.

Overall rating: 8/10

About the tester

Age: 40  Height: 190cm  Weight: 102kg

I usually ride: whatever I'm testing...  My best bike is: Genesis Equilibrium 853

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: commuting, club rides, sportives, general fitness riding, fixed/singlespeed, mtb, Mountain Bike Bog Snorkelling, track


Dave is a founding father of, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.

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