Had read this helmet runs on the small side but I haven’t experienced this,I have been wearing a medium in a giro and this helmet fits the same.Good ventilation pretty light weight and the boa retention system works great.My head measured 55.24cm and had originally ordered a large but changed it to a medium and glad i did it was a perfect fit.

need to return this item.. sizing runs different. get a bigger size.

Looking for a new helmet, as my old is a POC OCRA.
Review look promising however the helmet is just too narrow for my head even with a large. This will be suitable for a narrow head. I end up getting a POC Ventral instead Large which fit my big head. Too bad it doesn't fit.

The best fitting and comfortable helmet I have owned. The boa system is great. I sometimes forget I have it on.

I have had several high end Giro helmets and I have been very happy with them. I went to SLC to do a ride and when I got there I forgot my helmet. I decided to just go buy a new one since my Giro's are getting older and ready to be replaced. I tried this helmet on and it felt really comfortable. This helmet is the most comfortable helmet I have ever wore. In fact, I am now looking at replacing my MTB helmet with an Oakley one as well. Would buy this again.... And Again.... And Again.....

I purchased this helmet when it was on sale. My other helmets are getting old, the price was right and it looked good. My go-to helmet in the past had been a Specialized S Works Prevail II. I found this Oakley Aro3 to be much more comfortable than the Prevail II. I actually had to check to make sure that I had it on as I started yesterday’s ride. Airflow is very good. Not quite as good as the Specialized Prevail II but astronomically better than the Giro Air Attack Shield. My head is 7 ¼ and the large helmet had plenty of adjustment range so I can wear my sweatband at the same time.

I have had many helmets over the years and found this to be nearly perfect. Quiet, comfortable, and cool. I have worn it through the humid summer heat on the east coast. Cross season just started and it stayed in place while riding over the river and through the woods. After putting it on, I forget it is even there. I found the fit to be exactly per the measurements. There is a snap adjustment inside for the 'depth' of fit and I wonder if some folks have missed that. The only down side might be lack of adjustability of the side straps, but I surprisingly never found it to be an issue. I have tried some of the other new Oakley cycling apparel as well and they seem to be moving in the right direction. Almost forgot....It holds my Oakley sunglasses better than any other helmet. Good thing they did not miss that one!!

Fantastic helmet. The BOA system is brilliant on a helmet. It makes the old plastic ratchet cranium mechanism on other helmets seem outdated. Lazer helmets tend to fit me well and the Oakley helmet fits perfectly. Love it!

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

Positives:
-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

Negatives:
-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 tight....at 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.

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.

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.

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.

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

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.

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