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Item # GIR007F

Cooler, lighter, but still a classic.

If you're into road cycling, then chances are good that you've owned, or known someone who's owned, an Atmos. It's been a staple of ours and our riding buddies for so long that it's hard to imagine not seeing one bobbing up and down in the group. Now, Giro has made the risky decision to release the Atmos II. We're happy to report that the original design remains largely intact, but there is one key addition that ups the ante for safety across the industry: Giro's Thermoformed SL Roll Cage.

The SL Roll Cage is the skeleton that gives form to the helmet's EPS liner. It keeps the helmet together under impact, acting like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Atmos II without sacrificing safety, so it's more ventilated and lighter than its predecessor. The Atmos II still takes advantage of Giro's In-Mold Composite reinforcement, which permanently fuses the outer shell and SL Roll Cage to the EPS foam liner to enhance the effectiveness of all three.

In an age of mass production, Giro's Roc Loc 5 Fit System makes the Atmos II fit like a custom one-off. You can custom tune the fit tension as well as the fore-aft tilt of the helmet in seconds with one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems.

Keeping your head cool during even the hottest, most critical road races is something that Giro has focused a great deal of attention on. Giro helmets are developed with a proprietary Wind Tunnel Ventilation System that combines 26 vents in the shell with exhaust channels within the belly of the helmet leading to the rear. Fresh, cool air from the front is strategically channeled around the head to help evaporate the sweat before exiting through the rear exhaust openings. It's a natural cooling system that you'll appreciate every ride.

  • Roc Loc 5 adjustment system
  • 26 vents with exhaust channels that lead the air over the head and out of the back of the helmet
  • X-Static pads inhibit bacteria growth

Tech Specs

Shell Material:
in-mold polycarbonate, Thermoformed SL Roll Cage
Impact Foam:
EPS
Ventilation:
26 Wind Tunnel vents, internal channeling
Fit Adjustment:
Roc Loc 5
Visor:
no
Claimed Weight:
[medium] 270 g
Recommended Use:
road cycling
Manufacturer Warranty:
1 year

Size chart

Giro

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)
Cipher
 XSSML
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

REVIEWS

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A must have

  • Familiarity: I've used it several times

Lightweight and comfortable. Exactly what one needs when riding. Need to play with the straps to get the right adjustment but you will be happy you have it.

One of the best bike helmets ever made

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

I have been riding for nearly 40 years.
Have used so many different helmets, but, hands down for the protection, style, weight, comfort and fit and, the price, specially, if it is on sale, the Giro, Atmos, helmet, is hands down, the best helmet that Giro has ever designed and created.
I have been using it ever since it first came out.
Unless you think about it, while riding, you do not really, "feel it."
This one is a true classic.

Given as gift - but he's raved about it

  • Familiarity: I gave it as a gift but have feedback to share

No sense re-inventing the wheel - right? Gave this as a gift to replace the dad-in-law's nappy old one. Fit, style, use exactly the same as they were before and he's as happy as can be. One of the best things about Giro helmets are how adjustable they are, and the Atmos is no exception.

nice and simple.

  • Familiarity: I've used it several times

I dont ride my road bike all that often but i love this helmet for the fact I can't tell its even there.very light , comfortable well made helmet

Avg. ride time: 15m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

amazing adjustability

  • Familiarity: I've used it several times

Great helmet, super light weight and amazing adjustability.

amazing adjustability

Don't even know it's on

  • Familiarity: I've used it several times

So far i am loving this helmet, super light weight, comfortable on my head to the point where i forget it is there. I don't think there is better helmet for the price, would recommend to anyone looking for a great road helmet.

Comfy, light and does a great job

  • Familiarity: I've put it through the wringer

1. Comfy

2. very light

3. amazing adjust-ability

4. does a great job when you land on your head in a crit race - see attached pic

Comfy, light and does a great job

My Giro Aeon saved my noggin after a head collision with railroad tracks. I also have an Atmos which I also am pleased with, though I need some replacement pads. They offer a decent crash replacement discount if you contact them as well.

Unanswered Question

Always wore a large, measured my head at 22.75 inches so I ordered a medium. My head fits and everything seems great but I'm freaking out cause it looks to small and the back of my head seems exposed compared to my old $50 trek helmet. Any feedback from users will be appreciated.
Cheers, Mike T

Simple does it.

  • Familiarity: I gave it as a gift but have feedback to share
  • Fit: True to size

Sometimes a helmet is just a helmet. And there's nothing wrong with that. The strap isn't as soft as some, the shell isn't as obnoxiously "aero" as some, and the body isn't as minimalistic as some. It's not the most advanced (read: expensive) helmet, but it disappears once it's on, and that's what matters most. It's a classic for a reason.

Version II is better than ever

    Giro designs some of the best high-end helmets in the sport (atmos, aeon, synthe). Excellent gloves and aero covers too.

    I purchased my first Atmos helmet 12+ years ago. It was one of the first modern, really good looking, highly-vented, in-mold composite bike helmets made.

    Pros: Very, very well ventilated. Light weight. Strong. X-static (silver fiber) pads naturally inhibit sweat odor. Awesome looks. Affordable $$.
    Cons: none.

    This is a great Summer road helmet. The classic for a reason.

    Note: Make sure any helmet fits your head *shape* correctly (more round or oval). This is very important and true with any company's bike helmet. The only way to know is to try 'em on.

    Avg. ride time: 1h 59m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    If it aint broke, don't fix it

    • Familiarity: I've put it through the wringer

    I've been using the Atmos now going on ten years, still my favorite! Great lightweight design, comfortable fit and plenty of ventilation for those hot days in the saddle. I often forget I'm wearing it sometimes. This will be my third one, and I'll probably re-up again when the time comes.

    If it aint broke, don't fix it

    Same great helmet as it was 10 years ago

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

    This design certainly isnt new, but it shows how great it was when the original Atmos came out quite some time ago. Great ventilation, solid retention system, a fit that works well for me, and all at a lower price as this helmet has succeeded by others with snazzier options. I also own the Synthe and love it, but if you want the best helmet for your money this is it.

    Great helmet at a good price

    • Familiarity: I've used it several times

    I bought this helmet to replace an older Giro helmet I've had for several years now. The Atmos II is lightweight, better ventilated than any other helmet I've owned, and priced right. The Roc Loc adjustment is great, but I think my head is sized weird - so the medium is too small, but the large is a bit too big. The adjustment system does cinch around my head well - but it still leaves a gap on each side of the helmet and it doesn't feel that secure. The thin straps are unobtrusive but the ends were a bit long - which I easily solved by cutting the excess strap material and singing the ends. The foam on the bottom lip of the helmet is fairly exposed though - so one concern I have is the long-term durability of it.

    So aero bro...

    • Familiarity: I've put it through the wringer

    Although my road cycling helmet is minor I am a guy that owns a lot of helmets! This one ranks right up there in terms of lightweight and breathability.
    Huge vents dump heat when stationary and cranking 30mph it almost gets chilly. While the suspension adjustments are easy to use and very accommodating for wearing a liner or having (my problem) really long hair.

    Sizing was pretty standard for me, I have 5 other Giro helmets all in size large and this one is no different.
    For the money, I am very happy with this helmet. I know there are better but there are also cheaper ones that don't perform as well.

    This Helmet Gets Better With Age!

    • Familiarity: I've put it through the wringer

    I previously wore the original Atmos for about 6 years and absolutely loved it. No doubt I wanted the new model. The Atmos 2 is even better. It vents incredibly well which is important for the hot sticky days here in the Mid Atlantic region. The best upgrade for the new version is the rock lock system. It has a super easy adjustment knob on the back that can be done on the fly. For what is now a mid level priced helmet I can not imagine a better choice.

    Almost as nice as a Giro Aeon

      Great road bike helmet, which is almost as stylish as my old Giro Aeon, at a much lower price. Still a Giro quality build, designed and made to protect the head.

      Almost as nice as a Giro Aeon

      I like it

        I'm not a big fan of the look of most cycling helmets. This one is as cool looking as you're going to get. I initially purchased the medium size, which did fit but looked tine. The large I replaced it with looks and fits much better. I would recommend.