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Giro Air Attack Shield Helmet

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Item # GIR0399 Past Season Colors

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Item # GIR0399

Shield yourself from drag.

Traditionally, aerodynamic cycling helmets have relied on sloping shapes, minimal venting, and a teardrop tail design to dictate the flow of air in order to overcome aerodynamic drag. However, with Giro's new Air Attack Shield, its engineers had to rethink the shape of this typical design. The reason for this was simple -- the objective of the Air Attack was to mate an aerodynamic helmet with a design that was compact, well-ventilated, and able to be worn for long periods of time.

To start, the helmet was designed with a similar frontal area as Giro's Selector time trial helmet, only with a new 'chopped-off' rear section. Wind tunnel testing proved that the air still 'thinks' it's moving around a long tail, when, in fact, the excess material no longer exists. In addition to now having roughly the same minimal drag (only 11% more) than the Selector, the Air Attack provides a drastic increase in weight savings. In fact, the claimed weight of the Air Attack (without the shield attached) is 264g versus the Selector's 430g.

The second major consideration when designing the Air Attack came down to thermodynamics. After all, Giro's engineers knew that a lightweight, aerodynamic helmet was worthless to the peloton if didn't ventilate well. This led Giro to the development of what it calls 'the Therminator,' which is a head-form heated to the temperature of a human, with 'thermo-couples' added on the outside. The information relayed from this system allowed engineers to map out parts of the head that stayed both cool and warm in the wind tunnel, which let Giro locate where vents were working and where they were not. What Giro found was that as air hits the rider, there is a very high pressure zone right at the forehead. In response, the Air Attack's new fit system, known as Roc Loc Air, suspends the rider's head off of the EPS, allowing air entered in that front three millimeter portion of the helmet to flow over the top of the head and out the large, strategically placed back channels. Remember that 11% additional drag over the Selector? The 28% increased cooling power achieved ought to make up for it.

As for the shield itself, Giro collaborated with Zeiss Optics in order to create the polycarbonate design. This partnership developed into a broad lens with high-levels of both durability and clarity. In fact, Giro argues that the shield provides a wider field of coverage and view, given that it's free from any framing. And this brings us to our next topic, the shield's attachment. Essentially, the shield is held by three magnets at the front of the helmet. This system of attachment allows you to spin the shield around, up and out of the way. You'll notice that the field docks automatically, and creates a streamlined frontal surface with the Air Attack helmet.

The Attack isn't as light as Giro's fully-vented and top-end Aeon helmet, but it still provides you with 97% of its cooling efficiency and an 11% boost in aerodynamic efficiency. We'll let you weigh the trade-off.

The Giro Air Attack Shield Helmet is available in the sizes Small, Medium, and Large and in the colors Black/silver, Black/red, Blue/black, and White/silver

Tech Specs

[helmet] polycarbonate, [liner] EPS foam
Adjustable Vents:
Fit Adjustment:
Roc Loc Air
Claimed Weight:
[without shield] 264 g
Recommended Use:
road and track racing
Manufacturer Warranty:
1 year

Size chart


Adult Cycling Helmets
 SS/MMM/LLXLAdult UniversalWomen's Universal
Head Circumference 20 - 21.75in
(51 - 55cm)
20 - 22.5in
(51 - 57cm)
21.75 - 23.25in
(55 - 59cm)
21.75 - 24in
(55 - 61cm)
23.25 - 24.75in
(59 - 63cm)
24 - 25.55in
(61 - 65cm)
21.25 - 24in
(54 - 61cm)
19.75 - 22.5in
(50 - 57cm)
Head Circumference 20 - 20.75in
(51 - 53cm)
21.25 - 22in
(54 - 56cm)
22.5 - 23.25in
(57 - 59cm)
23.5 - 24.25in
(60 - 62cm)
How to Measure:
For best results, use a tape measure to measure around your head where your hat would fit comfortably.

Reviews & Community


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Bug Eyed Biker

  • Familiarity: I've put it through the wringer

I love this Helmet. I have yet to wear shades or goggles since I bought it and find that to be priceless. Well below freezing the shield does not fog up. Two tiny vents at the top allow it to stay clear on freezing days. In the summer this helmet is awesome as well, perhaps not as ventilated as some models, but it strikes a balance between aero and vent that i find to be ideal. A flick of the wrist and you can magnetize the shield into place, it is a strong connection and the only way to dislodge it is with intention. I snagged the floor model and saved 80 bucks, it was a bit steep otherwise. Certainly recommend.

Bug Eyed Biker

Great Helmet

  • Familiarity: I've used it several times

I bought it when it was on sale. I have 2 other helmets, so I use this once in awhile, when weather permit its jusitification. It is a nice helmet. I did not want to pay the original price for the helmet but always wanted this helmet. It fits well, makes me feel like I am a pro. I do not think all the hype o the aero helmet holds up. I do not feel any faster. I think riding harder and longer is what will make someone more aero, not necessarily a particiar helmet. Buy it it i it s on sale, but the original price is a bit much for such little gain. Unless you want to look cool! I have another Giro helmet that works just as good, so buy it if you have money to burn but wouldnt buy it again if it breaks or anything. Thats just me, vents well that is for sure, better than I expected.

Great helmet

  • Familiarity: I've put it through the wringer

This is a great helmet. This is my second one (drove off and left the first on my bike rack). Gives you the areo feel without the goofy teardrop. I would highly recommend it. Like the shield too and it works great!

So far pretty good!

  • Familiarity: I've used it once or twice and have initial impressions

Just wore it twice in mid 70 degree weather. One day was windy and other mild. Aero yes; ventilation sufficient and a non-issue, fit is also very good. I'm waiting to wear it a few more times before I provide more feedback or higher or lower rating. So far the only issue is also one of its selling points, the removal visor. 1) Helmet should be sold with at least two visors, one clear and one shaded. 2) The magnetic feature is ?cool? but not too secure. Be advised if you put your hand near your face and accidently make contact with the visor be prepared for it to come loose and possibly disengaged from the helmet. Luckily when this happen to me on its maiden test ride I was a stop light and only had to pick it up from the ground. No scratches on the lens but at speed the outcome could have been much worse. The visor comes down low enough so if I come up to the hoods I still have full eye protection, a major plus as I was reading other reviews stating the contrary. I wear a small so maybe larger headed riders may experience less visor coverage. Sometimes a smaller head may be better. Also, for a over $200.00 helmet Giro should provide a bag for not only protecting the helmet but also the visor.

Excellent product!!!!!

  • Familiarity: I've used it several times

I am very pleased with this helmet and the price was outstanding! My wife purchased these items for me for a gift to celebrate our new marriage. I couldn't be more happy with this and all my items/ The only con is that when my face sweats I have to take the entre helmet to wipe my face. Other than that this helmet is outstanding!

This is THE helmet!!!

  • Familiarity: I've used it several times

This is one awesome road helmet. Good for tours, triathlons and Sunday rides... One helmet does it all. The visor is great and easily flips and attaches / detaches. The magnets are perfect design.

Get this helmet!

Love This Helmet.

  • Familiarity: I've put it through the wringer

WOW - I'm VERY impressed.

- I thought the "gap" between my cheeks and the bottom of the lens would bother me but no. I removed that little rubber liner around the nose area as well - this way its all clear all the way around the lens. The clarity is pretty amazing and my field of vision is about 20% less restricted by the top of the frame - cause there is no frame.

- Ventilation is pretty darn good. Since the helmet "floats" above your head, the air flows in from the front vents and I can feel it cruising over the top of my head and then out the sides and back. In some ways it felt more efficient than my other helmets at cooling my noggin'.

- Form factor is great. It's lower profile (compared to my Kask & LAS helmets) looks good and doesn't sit on top like a mushroom on top of my head, despite it being designed to be worn like that. And hell.....I look like a "Tech-rider from the future" wearing it, it's so Tron/Stormtrooper -ish.

- Comfort is pretty good. But not as comfortable as my aforementioned helmets. I think KasK and LAS still beat everyone else in this regard. The Italians really know how to pad their helmets with the right kind of adjustable straps. It would have been nice if Giro took a lesson from them in strap design for the occipital lobe.

- Not a SINGLE drop of sweat on my lens after my ride. Amazing. And I sweat like a racehorse - my Oakley Radars had to be wiped down at least twice each ride because of the pooling and drying of the sweat on the lens. Also, since the Oakleys -were so close to my face, my facial heat would fog the lenses up whenever I stopped. On the Giro, the entire lens is on the helmet, so there is a big enough gap to allow for proper ventilation that dries up sweat on my face before it can dribble down and prevent any "fogging".

- Integrated Helmet Lens = No frame-bridge on my nose. No Pressure. No adjusting. YES.

I had some apprehensions before purchasing, after reading numerous reviews, but very happy I did :) No Regrets!

Love This Helmet.

Okay...but not blown away

  • Familiarity: I've used it several times

Is a little bulky/big if you ask me. And the eye shield doesn't come down low enough on the face to make it practical for wearing for long-rides without sunglasses. I was concerned about overheating, but generally I'm quite please with the cooling....note, if you get an itch in your head though, you're not jamming your fingers into those tiny vents to scratch it...endure or take the helmet off.

Is the magnetic visor sold in a transition...

Is the magnetic visor sold in a transition lens? I would love if it shaded in sun and cleared up in shade. Thanks, Kiki (Photo Credit:

Is the magnetic visor sold in a transition...
Best Answer

Hey Kiki,

Unfortunately, Giro does not sell a transition lens/shield for this helmet.

If you have any further questions feel free to contact me at


It sure got a lot of attention between SF and LA on last week's AIDS/Lifecycle ride - worked REALLY well! Visor was great to have on the windy days and really left me feeling less fatigued when it came to dealing w/sand, dirt, winds and blazing sunshine! Photo Credit:


Can i convert my regular gir air attack...

Can i convert my regular gir air attack to shield?

No...there is a molded indent at each magnet location. If you simply glued magnets to the front of the helmet there would be a large gap between the helmet and shield. The metal on the shield has a rim that locks into the indent at each magnet.

Avg. ride time: 10h 17m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Aero Life-Saver

  • Familiarity: I've put it through the wringer

This was a great helmet! I bought this helmet for the 2014 racing season. I loved for the early year cold weather crits. It even seemed to be pretty comfortable in hotter conditions like at collegiate nationals this year. I'm positive that it saved me some watts. However, I believe the most overlooked feature of these helmets are their ability to protect. I crashed into a car recently, and this helmet took the majority of the damage and completely saved me. Thank you giro for great engineering, and I will definitely buy another!

Aero Life-Saver

What lenses are included with this helmet?...

What lenses are included with this helmet? Are there 2 of them - clear and grey? Please advise, I have not found this data in product description...

Best Answer

It comes with the pictured lense that is tinted. You can purchase a clear shield lense separately.

Helmet Head, good or bad?

  • Familiarity: I've used it several times

Seeing as I don't see many people ever wearing this helmet on the road, especially with the visor, I don't know if I like looking like a futuristic bug or not. It does vent very well in hot weather and the shield is very cool, works to keep my contact lenses from turning into crackly crisps, but I guess you gotta have balls to go Tron in public. Ah well, who cares what people think?! I'm head to toe in spandex anyways...get this helmet!

The shield....does it hold fingerprints like crazy....

No fingerprints. It's easy to grab it by the edges when moving on and off.

shield colors

  • Familiarity: I've put it through the wringer

When Are other shield colors going to be available?

Otherwise, this helmet is the best thing since sliced bread. I've ridden it in hot/dry and hot/humid weather and ventilation is zero problem. Don't know about "aero" but it's far and away the most comfortable helmet I've ever ridden!

i would love to see them partner with oakley , i won't leave my oakley glasses and i don't like the lens colors they offer (giro) but put them together,

done deal !!

Where can I purchase a replacement shield...

Where can I purchase a replacement shield for my Giro attact helmet. Mine was stolen

Best Answer

Giro Helmet Replacement Parts: 800-456-2355