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Item # GIR0273 Past Season Colors

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Item # GIR0273

The Giro Hex Helmet handles all the cranium-protecting duties and lets you focus on riding.

Hit the trail without worrying about your lid. The Giro Hex Helmet handles all the cranium-protecting duties and lets you focus on riding. The new RocLoc 5 adjustment system allows for simple horizontal and vertical adjustment without taking the helmet off, so you can get it dialed quickly and get pedaling. The adjustable visor helps keep the sun ot of your eyes, and 21 vents keep your brain from overheating on the climbs.

  • All-mountain riding
  • In-Mold construction
  • RocLoc 5 adjustment system
  • 21 vents

Tech Specs

Recommended Use:
trail, all-mountain
yes, P.O.V.
Fit Adjustment:
Roc Loc 5
21 vents
Impact Foam:
in-mold EPS (foam)
Shell Material:

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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Great fit, look, and price!

  • Familiarity: I've used it several times

wish the straps fit a little better where they come together under the ear, they don't lay flat. Other than that its a solid helmet.

Great fit, look, and price!

Bike Helmet

  • Familiarity: I've used it several times

This is a bike helmet. As bland as that sounds, it's pretty much all you need to know about the Hex helmet. It's light, comfortable, fits well, breathes well, and won't break the bank. Sure, it doesn't look as cool as the latest Troy Lee design, but I want my helmet to be an essential piece of gear, not a fashion statement. Put it on, forget about it, and go for a ride.

Great fit, super ventillation

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

I love my Giro Hex helmet.
The colors are super fun, and the helmet fits comfortably with great ventilation. I've always used a POC Trabec, but find that my head gets really hot in the summer, and this was a great alternative that looks the way I want it to look, keeps my head safe, and keeps me cool. The price is pretty hard to beat as well!

Fits great!

  • Familiarity: I've used it several times

I like how it stays on my head. It's lightweight, looks good aside from the color (i got the color that was on sale) and it was nice while riding off road in some pretty rough stuff. It's much better than my old helmet.

That's wearing the helmet.

Solid helmet

  • Familiarity: I've put it through the wringer

This helmet has great fit and ventilation. I live in Phoenix, where I expect something that's not going to let my head overheat and this does the trick. My boyfriend tried out my size S helmet a couple times and loved it, so he bought his own. He ended up buying his normal size M, to give you an idea of the overlap in sizes accommodated by the RocLoc system. The helmet's adjustability makes it feel very secure yet comfortable. Really can't beat this for the price!

Solid helmet


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

I got this helmet as a gift for my boyfriend, who has a hard time finding helmets because his head is pretty large. The XL fit him perfectly, and he says it's comfortable, has great ventilation, and feels safe and secure


  • Familiarity: I've used it several times

I bought this as a gift for my dad after hearing great things. He loves it! He said that it fits his big noggin and is true to the sizing chart. He likes how lightweight it is and the large vents make it nice and cool for a summer ride. He recommends this helmet to anyone looking for a quality helmet at a fair price. Two thumbs up!

Maybe not my style?

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

I grew up with freestyle bmx and skateboarding helmets like the old pro-tec. They would cup your head and feel almost glued on. I did not get the comfort and protection feel I wanted out of this helmet so I ordered something more familiar. I was using this for full suspension mountain biking xc and downhill.

Great Helmet

  • Familiarity: I've used it several times

One of the cheaper options out there, and yet the construction is solid, the helmet is super light and on hot days it still allows your head to breathe really well. Haven't smashed my head yet but will report back on how that feels if I do.

Great deal

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

I am surprised the white with California Bear is a discounted color. The bear and graphics are hardly noticeable, great deal for light,
well vented dome protection with good adjustability. Size fits accurate to measurements in the small I got for the lady.

Rambo Ridge - Trade, TN

Thanks for protecting my dome! Great light weight helmet and the RocLoc adjustment system keeps the helmet on my head when I sometimes forget to buckle up.

Rambo Ridge - Trade, TN

New helmet

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

I got this helmet for my older son to replace a broken one. He loves it - the fit, the visor and the map/bear on the back. He really liked his old helmet and hated to get a new one but has been very happy with this one.

Helmet Upgrade!

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

For years my good friend used a ski helmet (sans liner) as a mountain bike helmet in the summer. I just couldn't have them sweating up a storm like a goober any longer under my watch. Thankfully I give great birthday gifts, like this helmet! My frequent riding buddy is now styling and stoked! This helmet is very light, vents well, and the adjustable fit makes sizing a breeze!

Great Helmet

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

I really like this helmet, tons of air flow and looks pretty cool. The Roc Loc 5 system is really solid and hugs my head perfectly. With a couple clicks the helmet is perfectly snug and won't fall off of my head even if the straps aren't on (although obviously you should use the straps).

Avg. ride time: 2h 40m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Love it!

    Had this helmet for 2+ years (an older color but same one) and I absolutely love it. Super comfortable, cooling, stays in place, no issues, cool colors. I'm cooler wearing it than not! And it's a really reasonable price compared to other helmets.

    Can fit a big noggin'!

    • Familiarity: I've used it several times

    I went with an XL because my hat size is 7 7/8. I happy to say that I actually had to tighten it a little to get a proper fit. The only issue I have is how the velcro is adhered to the helmet - it could be stronger, but as long as you're careful removing it, you won't have any issues.

    Almost perfect...

    • Familiarity: I've used it several times

    This helmet is awesome. It fits great, is very light, offers excellent airflow, and is well padded.

    The ONLY concern is the split in the pads in front. I sweat a lot, riding here in AZ, and it runs into my eyebrows. I don't love that about it but everything else is stellar.