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Aries Spherical Helmet

5 out of 5 stars
2 Reviews
Color:Matte Ano Harbor Blue Fade


Size Chart


Why We Like The Giro Aries Spherical Helmet

Whether we're chasing the World Tour or just competing in our local crit series, the Giro Aries Spherical Helmet keeps our dome protected thanks to a new MIPS Spherical design. Built to be lighter and lower profile than the Aether, the Aries delivers best-in-class protection with insane amounts of airflow so that we're not overheating during big climbs and finish line sprints.


  • Ultra-lightweight road helmet built with best-in-class protection
  • MIPS Spherical system helps protect our brain in nasty crashes
  • Aura Reinforcement Arch adds strength and durability
  • Roc Loc 5+ Air system allows for a personalized, secure fit
  • 5 Star Virginia Tech Helmet Rating gives peace of mind
  • 24 vents and internal channels maximize airflow at all speeds
  • Extra grippy sunglasses port holds our sunnies securely all ride long
  • Item #GIRZ36W
Shell Material
Impact Management
MIPS Spherical, dual density nanobead EPS
Fit Adjustment
Roc Loc 5+ Air
Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older, CE EN1077
Claimed Weight
[medium] 9.7oz (275g)
road cycling

Overall Rating

5 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 2 reviews

Fits Slightly Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

April 21, 2023

My Favorite Brain Bucket

I've put it through the wringer

I’ll start by saying I don’t believe in using words like perfect, always or never. Absolutes are very hard to live up to. That in mind, this is a terrific helmet and I am very happy to have it. In September 2022 I was hit by a car while riding and having a good helmet saved my skull, if not my life. Full disclosure, that was a POC Ventral SPIN and I immediately bought a new one. That said, while I like the POC it is bulky and does not do a great job of sweat management. These are two areas where the Giro Aries stands out. Fit is very slim to the head and the padding in the front does far better at absorbing and/or redirecting sweat so it doesn’t drip on glasses. The fit adjustability of the Giro is also absolutely next level. The adjustment system allows you to slide forward and back (moving the dial up or down the back of your head) and also has horizontal adjustment. This adjustability means you can cradle your noggin exactly how you want, and make sure the plastic arms are well out of the way from the temple pieces of your sunglasses. The real cherry on top for me is one I hope to never test - the safety. Despite being crazy light, the Giro Aries is the top scoring helmet that Virginia Tech has ever tested. Period. This one checks all the boxes for me - safety, style, comfort, air flow. This is the best helmet available in my opinion. The only slight complaint is the salt buildup that accumulates on the chinstraps, but candidly I have yet to find a helmet where this is avoided. From a size perspective, my body dimensions don’t mean anything so I haven’t included. That in mind, if you measure your head per Giro’s instructions the fit will be dead on accurate.

Gino C
5 out of 5 stars

February 18, 2023

My new favorite helmet?

I've used it once or twice and have initial impressions
Size Bought:
5' 9"

Just got this and wanted to write a quick review about the sizing. But first, I've had many helmets over the decades of riding, and am pretty confident that this is the best of all of them. It is very comfortable to wear - I especially like the soft padding across the forehead where some other helmets had high spots that would leave marks. The helmet looks great. And the safety features and ratings make me feel safer. I'll have to wait for warmer weather to see how the cooling works, but the venting is great, so no worries there. But I did have an issue with the sizing (which Competitive Cyclist fixed with a quick replacement). My head measures 23.25", exactly the break point between M and L sizes according to the chart. But when I tried the M it actually hurt to wear and left deep marks in my forehead, and my head was so tightly squeezed against the inner foam in the back that the adjustment did nothing and I couldn't even get it on when I wore a thin bike cap. The L fits well. People say that if you are in between helmet sizes you should probably choose the smaller size, but for me with this helmet the larger size was better.

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