Bikes Are Back! Shop Our Selection
This carousel displays a list of buttons that updates the main product image when a button is clicked
  • Options
  • Detail Images

OakleyAro5 Helmet

Sale 50% OffCurrent price:$124.95 Original price:$250.00

Item # OAK01MX

Select options
  • Cancel
  • Select options
  • Black, S ($124.95)
Add Protect+ Powered by Extend™
  • 100% Guaranteed Returns
  • Free Shipping on orders over $50

Item # OAK01MX

Aro5 Helmet

Occupying the middle ground in Oakley's line-up between the airy-ventilated Aro3 and time trial favorite Aro7, the Aro5 Helmet provides a streamlined profile at real-world yaw angles and MIPS technology for the discerning cyclist. Ultimately, the Aro5 satisfies those cyclists seeking an aerodynamic advantage, but without sacrificing much in the way of ventilation or compromising on comfort across long distances.

When first designing the Aro5 Helmet, Oakley formed a baseline around MIPS technology, seeing it's now ubiquitous with all premium cycling helmets on the market. This allowed Oakley to create a purpose built helmet around this impact-dispersing technology, instead of dropping in a MIPS liner and calling it good. Soft brow and crown pads help to distribute pressure when you're cranking it down tightly, so you don't have to worry about pressure points.

Another innovative feature with the Aro5 is the ability to integrate with your favorite eyewear. Oakley achieves this with a Boa FS-1 fit system that controls a low-profile nylon webbing that tightens evenly in 360 degrees, but without bunching or catching on sunglasses arms like other fit systems. There's even an eyewear dock built into the front vents, so you can securely stow your shades while pulling off the road or walking into the local cafe.

Delving into its aerodynamic prowess, you'll find wide channels along the front reduce drag in multiple cycling positions and effectively move airflow across your head to prevent overheating. There's a race car-inspired scoop at the top of the back, which grabs moving air, then channels it into multiple rear exhaust vents. Additionally, it's very narrow and short in stature to maximize the helmet's aerodynamic efficiency at yaw angles between zero and 10 degrees, which is where most cyclists spend their time.

  • Aerodynamic cycling helmet doesn't sacrifice ventilation
  • Built around MIPS tech for dispersion of rotational impacts
  • Designed to maximize efficiency at yaw angles of 0 to 10°
  • Wide channels at front optimize airflow and aerodynamics
  • Top scoop that channels air out of rear exhaust ports
  • Boa FS-1 fit system with 360-degrees of adjustment
  • Eyewear dock along front vents for convenience
  • X-Static brow, crown pads for stink-free comfort

California Proposition 65


Reproductive Harm -

Tech Specs
Shell Materiallightweight polycarbonate
Impact FoamEPS impact foam, MIPS low-friction liner
Ventilationwide ventilation channels at front, top scoop with rear exhaust vents
Fit AdjustmentBoa FS-1 dial with 360-degree fit
Manufacturer Warrantylimited lifetime


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.

What do you think about this product?


>Rating: 3

The strap loosens, safety issue.

I've put it through the wringer
True to size
Size Bought
5` 5"
150 lbs

I think they need to recall this helmet for safety issue or have a fix remedy for it ,every time I adjust my strap it does not take long that it will get loose all the way. The air doesn't vent enough. The only thing I like about this helmet is Boa FS1 system.

>Rating: 5

Great Helmet & No Complaints

I've used it once or twice and have initial impressions
True to size
Size Bought
5` 7"
170 lbs

This is my first official helmet and unfortunately I don’t have anything else in the past to compare this to so with that in mind you can tell that I am new to cycling. Starting with the look, after watching a ton of videos on YouTube, I was really concerned about the “mushroom” look but after physically trying this helmet I was really impressed. In fact, I get compliments on the look and the style. Please note I went with the polished black. Next the fit, initially I purchased a small since my head circumference was at 56 cm and a small is recommended based on Oakley’s website, however, after receiving the helmet in the mail it was way too small. It looked like a small child’s helmet, so I ended up returning it for a medium which fits perfectly. The helmet is very comfortable and the boa system is very easy to use. Lastly, I want to add my head temperature inside the helmet. Many reviewers have complaint about how hot their head feels after wearing this helmet but I haven’t experienced this myself but to be fair it’s currently winter season. I live in Georgia where it can get brutally hot, but currently we are in the winter months, however, we have had a few days in high low 70s and my head has felt cool and not sweaty. I am hopeful with the aero technology and the large vents, my experience will stay the same as I don’t plan on cycling when it’s typically anything over 84 degrees but we will see in the coming spring/summer months. On a last note, just wanted to share that my experience with Backcountry as a new customer has been awesome. Whenever I have called and spoken to their live customer service members, they are always very respectful and helpful. Thank you!

>Rating: 4

Just didn't fit

I returned this product before using it
Runs small

Bought this for my wife. Helmet is beautiful, The Medium was too small for her. I ordered a Large. the BOA wires pressed down on her ears. Even when adjusted as high as it would go. Too bad. A good looking, quality helmet at a good price.


Oakley ARO Series Cycling Helmets

Introducing Oakley Aro Series Cycling Helmets. Designed with aerodynamics, thermoregulation, eyewear integration and protection at their core.

What was the point of this?

>Rating: 5

Exactly What You Would Hope For

I've used it several times
True to size
Size Bought
5` 10"
185 lbs

When you buy an Oakley product, you expect nothing but the best. Be it in research and design, the technology within the product, or strictly the aesthetics, they always seem to surpass the needs of the rider in mind. The ARO5 helmet is no different in any way. Incorporating the latest with MIPS technology, the lid will not only keep you incredibly safe SHOULD you ever need it, but allows you to keep a clean professional look while riding. The fact that Oakley managed to find the perfect harmonious balance between weight, safety, and breath-ability is nothing short of what we expected, but are always thankful to have once your heart rate starts getting turned up. It won't be long before this helmet is one of the top ranked in the industry, as their team definitely knocked this one out of the park! If you have any questions about the ARO5, please don't hesitate to reach out to me at 801.204.4555. Thanks so much!

>Rating: 5

Speed and Comfort on Lock

I've used it several times
True to size

I typically have a Giro head, helmets with a more oval form tend to fit me the best. This means Giro, Kask, POC, etc. The Oakley helmets are some of the best fitting helmets I have tried on. This ARO5 breathes really well and I would not hesitate to grab it on hotter days. I think if you are more of a climber and the ability to ventilate at lower speeds is the most important then I would gravitate toward the ARO 3.

>Rating: 5

Pretty sweet lid

I've used it several times
True to size
Size Bought

Overall fit and finish is nice on this helmet, once I had the straps dialed in fit was very comfortable and you don't notice it is on. The fit system is very unnoticeable as it should be once the helmet is on and dialed in. Price is attractive for a high-end aero road helmet. Would recommend if you are looking for an aero helmet.