Our most popular helmet ever.

The Giro Atmos Helmet remains our top selling helmet of all time. Need we say more? The reasons are many, so yes, maybe we could throw a few more words your way.

Let's start with the design. Don't act like you don't look in the mirror when trying on a helmet. The Atmos's profile was radical when it debuted, and it's still progressive without being jarring or awkward on the eyes. The slight ducktail at the top of the back of the helmet is the termination of a smooth and beautiful arc that can be traced from the "fangs" that begin above the brow. We think it looks great, and the wide ventilation channels are sculpted to compliment the design.

Speaking of those vents, form and function certainly coexist here, but that function is what will win you over. Strategically placed to pull warmer air away from your head while maximizing the volume of fresh air that they pull in, the Atmos actually has more vents than Giro's top-dog Aeon helmet (although the Aeon is lighter and its total ventilation area is greater than that of the Atmos, their ventilation performance is very similar). The vents are in turn complimented by internal channels that pull the air all the way around your dome, ensuring total breathability. In short, The Atmos creates its own "atmos"phere, keeping you cool even on the hottest days.

Keeping you looking and feeling cool, however, isn't the purpose of a helmet, however. It's protection, and Giro saves its biggest engineering guns for this most vital of tasks. The Atmos utilizes Giro's In-Mold Composite reinforcement construction system, bonding the outer shell to the impact-absorbing EPS foam liner into what becomes a single piece that deflects and isolates impacts better than the sum of its parts. It also makes the helmet lighter, ringing in at a scant 256 grams for a size medium, thanks in part to the Roc Loc 5 fit system that allows micro adjustments and also weighs about 40% less than competing mechanisms.

The Giro Atmos Helmet is available in the sizes Small, Medium, and Large and in the colors Highlight Yellow/black, Matte Black/blue, MC Hesheer, Matte Black/white, Matte Titanium, Matte White/silver, and Red/black.

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Here's what others have to say...

5 5

saved my bacon

I use the atmos for mtn biking and on the road. I recently crashed while coming down a mtn road. a 4 wheeler was coming up on the wrong side of the road on a corner. I had to evade a head on and hit some loose gravel, went down hard. the helmet did it's job, it cracked so my skull was saved. some good road rash was the only pain full part. no lOC from hitting my head. I'm ordering another today.

4 5

Protect that pretty head of yours!

  • Familiarity: I've put it through the wringer

Great, lightweight helmet. Keeps your head cool. Also looks great. I was involved with in bike/car accident and my helmet held up in a high speed impact. I ended up getting a new helmet in case their were defects from the crash. My pads started wearing out after a year of use, which in turn made it uncomfortable to wear. There are replacement pads that you can purchase to replace them.

4 5

Too wide for my head

  • Familiarity: I returned this product before using it

I tried it, but the large was definitely too large and the medium was just a little too wide to be comfortable. I'm picky about hats/helmets though. It was nice and light, looked good, seemed like good quality. I'll give it four stars but it just didn't fit perfect.

5 5

Light weight

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

This helmet is light weight and very breathable. Fits great and looks awesome too. This will be great for when the temps get hotter. Excited to use it!

5 5

Loving this helmet.

  • Familiarity: I gave it as a gift

I use this helmet for XC trail and road riding. I find it to be the perfect level of versatility for both. It's a nice snug fit, is super light and strong. Plenty of ventilation for the summer time and has just enough room a headband or a lycra hat in the winter.

I tried the newer high end AEON helmet but prefer the slightly more compact fit and feel of the Atmos.

Loving this helmet.

What does this helmet weigh?

What does this helmet weigh?

Responded on

Giro has a listed weight of 280 grams with no size indicated, but reviews on other sites have come in with weights of 256 for a size medium. The more weight conscious helmet in Giro's line is going to be the Aeon helmet.

5 5

The classic

Giro is a really cool company. Based in Santa Cruz CA, they design some of the best high-end helmets in our sport (atmos, aeon, air attack). Excellent gloves and aero covers too.

I purchased my first Giro "Atmos" helmet over 10 years ago. It was one of the first modern, really good looking, highly-vented, in-mold composite/Kevlar reinforced bike helmets.

Pros: Very, very well ventilated. Light weight. Strong. X-static (silver fiber) pads naturally inhibit sweat odor. Awesome looks. This is a -great- Summer helmet. The classic for a reason.

Cons: none

Note: The reviews below are correct. Make sure any helmet fits your head shape (and size) correctly. This is very important and true with any company's bike helmet.

5 5

love it

  • Familiarity: I've put it through the wringer

I've owned 2 Atmos helmets (first one did it's job and protected me during a severe crash). Atmos fits my 59cm head perfectly and has room to expand when wearing winter head coverings. Top it off with excellent support from Giro when the pads broke down prematurely and this one is a winner.

4 5

Airy odd shaped

  • Gender: Male
  • Familiarity: I've put it through the wringer

Overall, this is a well constructed safe helmet. The sizing And shape of giro helmets is a little odd for non egg head people. If you size up its a bit oversized but you still get safe coverage.
I've had two falls with this and it's held up very well.

4 5

Light Protection

  • Gender: Male
  • Familiarity: I've put it through the wringer

When i started road riding, I found out real quick that a lighter, more ventilated helmet made for an easier ride temperature wise. So, I started out with the Giro Atmos Helmet and was glad I did. The 26 vents almost keep my head too cool and the roc-loc 5 keeps the Atmos snug on top of my head after a bit of adjusting.
Sizing can get a little tough if you are right at the 55cm (common) head size. I went with a medium and had to play with the adjustments a bit, but was able to get a snug fit.

5 5

Nice and light

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

This helmet is lightweight and comfortable... almost makes it feel like you're not even wearing it. The design keeps your head cool and protected. Simple but effective.

5 5

Quality Helmet

I've owned at Atmos for the last year, I love the fit, ventilation, and weight.

When it came time to shop for a lid for the lady, the Atmos was my first suggestion. After trying on a bunch of models and brands, she loved the fit of the Atmos the best. The retention system can accommodate a pony tail fairly easily; an important feature as she has long hair. The retention adjustment also makes for a very secure fit.

We got her the matte titanium colorway, we both love the look and I'm a little jealous that hers looks better than my standard black one.