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Oakley Aro3 Helmet


Item # OAK01MY

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Item # OAK01MY


Airy-cool excellence.

Part of Oakley's newest line-up of premium cycling helmets, the Aro3 Helmet is the lightest, most ventilated lid offered by the iconic eyewear company. Instead of focusing strictly on creating an aerodynamic, streamlined helmet, the Aro3 Helmet maximizes ventilation with elongated linear vents at the frontside, paired with specialized rear vents that promote airflow when you're climbing in a slow and steady manner. Oakley designed their Aro series of helmets exclusively with MIPS technology, so you'll have greater protection from angled impacts with the asphalt.

Seeing it's ventilated more than any helmet in Oakley's line-up, it only weighs 295 grams, meaning you'll barely even feel it there on longer rides. Besides being airy-cool and extremely lightweight atop your head, the Aro3 integrates seamlessly with your favorite shades. This is due to Oakley's use of a Boa 360-degree fit system, complete with lie-flat nylon bands that won't snag or catch on sunglasses arms like other fit systems on the market. There's even a handy sunglasses dock along the frontside, so you can stash your shades before walking into the cafe or pulling off the road to consult a map stored on your phone.

  • Lightest, most ventilated cycling helmet in Oakley's line
  • Maximum ventilation in both high and low-speed situations
  • Elongated front vents paired with exhaust outlets at rear
  • MIPS liner reduces rotational forces from angled impacts
  • Boa 360° fit system with lie-flat nylon bands
  • Eyewear dock in front vents for stashing shades
  • X-Static brow pad for comfortable, stink-free wear

Tech Specs

Shell Material:
lightweight polycarbonate
Impact Foam:
EPS foam, MIPS low-friction liner
elongated vents at front, rear vents for low-speed climbs
Fit Adjustment:
360 Boa fit system with lie-flat nylon bands
Recommended Use:
road cycling
Manufacturer Warranty:
limited lifetime



Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

295 g

Size Chart


Head Circumference

20.1 - 21.7in

(51 - 55cm)

21.7 - 23.2in

(55 - 59cm)

23.2 - 24.8in

(59 - 63cm)






Head Circumference

20.5 - 22in

(52 - 56cm)

21.2 - 22.8in

(54 - 58cm)

22 - 23.6in

(56 - 60cm)

Hat Size

6 1/2 - 7 1/8

6 3/4 - 7 3/8

7 1/8 - 7 5/8

How to Measure:
Measure around your head where your hat would fit comfortably.

Reviews & Community


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More like 3.5, but....

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Medium

I’ve been so back and forth on this helmet for a month or so.

-well built
-fit and finish are top notch
-“first impression” fit is really good
-I personally think the ventilation is good for an aero helmet

-the Boa tensioner doesn’t allow fine enough tension. One click is too loose and allows sweat into the eyes, the next click tighter is then too least in my experience
-my biggest issue is that my head doesn’t fit “in” it, rather it fits “on” your head. Could be personal preference?

Overall I think it’s a pretty solid helmet, just doesn’t quite nail it for me at all angles.

Avg. ride time: 5h 9m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Not really well-ventilated

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

First the good. It is super comfortable, the Boa dial works fantastic, and I feel I have a more secure fit than my other helmets. Truly no interference with my regular and riding glasses, which was key. Super comfortable, no pinch points. I also really like the looks alot. Today was my first ride with it, and while it was cool, in the mid-50s, humidity was 93% and was sunny once the sun rose. As a bald guy who sweats a lot from his head, I hoped this would cool off my dome through the large vents and supposed good aero-ish ventilation. Instead, I felt early on the heat of the brow pad, and could feel it filling up with sweat. While it didn't drip in my eyes, it felt like the dam was getting ready to burst by the time my ride ended. Some sweat went down my temples, so maybe it will be directed there, but when I came inside, by brow was covered in sweat and I could squeeze sweat out of the pad. Not what I wanted. I have a problem in the summer with salt in my eyes, an hoped this would work. It also isn't particularly light. My old $50 Giro Transfer helmet was slightly lighter and had the same/more vented surface area. Is it aero? No idea. This may be caught in the middle - not quite aero, not quite light, not quite cool. Sizing-wise, a medium fit as expected.

Not really well-ventilated

Great Oakley Helmet

  • Familiarity: I've put it through the wringer

The helmet is stylish and functional. I love that the helmet does not interfere with my eyewear and that it allows me to easily stow away my eyewear when not in use. I do agree with the comments related to the small sizing, however I found it to fit much better after adjusting the height. The height adjustment procedure is clearly explained in the helmet instructions, but if you are like me and don't read the instructions you might miss this point.

Great Oakley Helmet
Avg. ride time: 9h 34m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Most Comfortable Helmet I Own

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: Medium

The first time I put this helmet on my head I could not believe how comfortable it felt. The closure hugged my head perfectly and the MIPS did not feel bulky. The helmet looks nice and holds my glasses perfectly. I raced a Crit in the helmet the other night and the ventilation was surprisingly effective. The helmet looks awesome in my opinion and hold my Oakley glasses better than any other helmet I have. I wear a small in Specialized helmets, but had to size up to a medium. The helmet runs small.

Size inaccuracies

    Have been doing my research and the top size that Oakley shows in their home catalog only goes up to 60 cm for their size Large. My experience with helmets is that 60 is not a size Large. Before you order I think you should check with customer service, as to the accuracy of the displayed size, especially if you have a head bigger than 60 cm I wanted to order one but I am a 62-63 size. So I will not be ordering a Oakley helmet until this confusion is straightened out. And then, only if the size is 63 cm, as displayed on this sites size chart

    Sorry for the confusion with the size! We were not aware of difference in size charts. Oakley has confirmed with us that the correct size chart is as follows:
    SMALL 6 1/2 - 7 1/8 52-56 295g
    MEDIUM 6 3/4 - 7 3/8 54-58 295g
    LARGE 7 1/8 - 7 5/8 56-60 295g

    We should have this size chart updated for all Oakley Cycling helmets very soon.

    Stellar Oakley Product

    • Familiarity: I've used it several times
    • Fit: True to size

    This helmet holds true to all those things I remembered Oakley being. Cutting edge in style yet practical, light weight and comfortable. I have loved Oakley but drifted away over time because of price and other options available. This may have me back buying the shades. I have worn a size medium as long as I can remember (Specialized, Scott, and Smith) this fits along with those.

    Avg. ride time: 5h 2m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Nice...but small

    • Familiarity: I returned this product before using it

    Badass helmet but it runs small. Wear medium in Smith/Giro, need a large in Oakley, will be exchanging

    You are on the money with that assessment. According to Oakleys own size charts, the Large is sized as most other helmet companies size their medium helmets - 56-60cm in my book that is a medium. Right now Oakley has no size Large. I hope they fix this problem. But for now, larger headed consumers should be aware of this problem