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OakleyAro5 Helmet
Sale 20% Off$199.97 - $199.99

Item # OAK01MX

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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
Tech SpecsSize
Tech Specs
Shell Material
lightweight polycarbonate
Impact Foam
EPS impact foam, MIPS low-friction liner
wide ventilation channels at front, top scoop with rear exhaust vents
Fit Adjustment
Boa FS-1 dial with 360-degree fit
Recommended Use
road cycling
Manufacturer Warranty
limited 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.

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Just didn't fit

  • Familiarity: I returned this product before using it
  • Fit: 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?

Exactly What You Would Hope For

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

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!

Speed and Comfort on Lock

  • Familiarity: I've used it several times
  • Fit: 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.

Pretty sweet lid

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

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.