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POC Octal X Helmet
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Item # POC008Q

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Item # POC008Q


The Octal goes off-road.

POC's road-focused Octal has become a favorite among the XC crowd for its blend of light weight, unique styling, and protection. Road helmets are never quite a perfect match for off road applications though, so POC tweaked the design a bit to create the Octal X Helmet and give XC racers the lightweight, trail-worthy helmet they've been looking for.

As with the road version, the Octal X boasts extended coverage over the back of the head and at the temples for added protection no matter what surface you're riding on. True to its dirt-focused intention, the Octal X's shell extends to cover more of the liner foam than the Octal, which improves overall durability against errant trail debris without sacrificing lightweight functionality.

  • POC brings Octal styling to the dirt
  • Lightweight and durable EPS shell construction
  • Aramid bridge tech reinforces the helmet structure for added protection
  • Extended helmet shell provides coverage for foam liner
  • Large vents promote cooling airflow
  • Size adjustment system dials in the fit
  • Eye garage securely holds most sunglasses

Tech Specs

Shell Material:
large vents
Fit Adjustment:
size adjustment system
Claimed Weight:
[small] 250g, [medium] 270g, [large] 300g
Recommended Use:
cross-country, mountain bike
Manufacturer Warranty:
1 year

Size Chart


Head Circumference  21.7 - 22.8in
(55 - 58cm)
23.2 - 24.4in
(59 - 62cm)
Octal, Cerebel
Head Circumference  19.7 - 22in
(50 - 56cm)
21.3 - 23.6in
(54 - 60cm)
22 - 24.4in
(56 - 62cm)
Skull Orbic Comp, Skull Orbic X, Skull Comp, Super Skull Comp, Skull X, Skull Light, Receptor Bug, Sinuse, Receptor Bug Comm.
Head Circumference 20 - 20.5in
(51 - 52cm)
20.8 - 21.3in
(53 - 54cm)
21.5 - 22in
(55 - 56cm)
22.5 - 22.8in
(57 - 58cm)
23.3 - 23.5in
(59 - 60cm)
24 - 24.4in
(61 - 62cm)
Crane, Fornix, Fornix Backcountry, Skull Light II, Receptor Bug Adjustable, Trabec, Trabec Race, Receptor Flow, Skull Light Women's
Head Circumference 20 - 21.3in
(51 - 54cm)
21.5 - 22.8in
(55 - 58cm)
23.3 - 24.4in
(59 - 62cm)
Synapsis, Frontal, Receptor+, Receptor Backcountry
Head Circumference  20.9 - 21.3in
(53 - 54cm)
21.7 - 22in
(55 - 56cm)
22.4 - 22.8in
(57 - 58cm)
23.2 - 23.6in
(59 - 60cm)
Cortex DH
Head Circumference  20.9 - 21.7in
(53 - 55cm)
21.7 - 22.4in
(55 - 57cm)
22.8 - 23.6in
(58 - 60cm)
How to Measure:
Measure around your head where your hat would fit comfortably.

Reviews & Community


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Large is LARGE

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

The size chart for POC had me agonizing over what size to choose. I have a 58cm head, which falls RIGHT IN THE MIDDLE of the Medium and Large size ranges.
Should I size up or down? UGH!!!! I spoke with a GearHead on here and they recommended sizing up to allow room to wear a cap under it, which turned out to be bad advice. The size Large was huge and looked huge on my head. I felt like Rick Moranis in Spaceballs.
I ordered a Medium. The difference in the size of the shell between the two is considerable. While I'm definitely at the upper end of the Medium size range, I can fit it on over my thin Smartwool cap and my ear-warmer headband. The fit is nice and snug and it looks proportionate on my head. It's a winner.
My ending note has to do with a common criticism I read...the way the straps attach to the helmet DOES make it difficult to wear your glasses OVER the straps (I've normally worn my glasses under, so not a problem for me). I've seen pics of pros wearing their glasses over, but I think it bears mentioning at least in this review. Some people may not like the helmet because of this fact.

Great Helmet!

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

I gave this as a gift to my nephew, and he loves it. The fit is great and it's super light. Vents work well and cool off nicely, and the hi-vis color is awesome!

Feels like you arent wearing a helmet!

  • Familiarity: I've put it through the wringer

I was a little weary at first of POC octal helmets because they are so big and give you a mushroom head look but as soon as I put on this helmet, I was sold. It is remarkably lightweight and SO breathable. It fits my head really well and doesnt feel big or mushroom head like. I also especially like the silicone grippers on the inside vents that hold your sunnies there when you aren't wearing them. This works super well and holds the sunnies in place even when I tilt my head down, Coffee shop stop approved!! I also dig all the extra safety features that POC has to offer. Gives me extra peace of mind knowing that I am protecting my noggin with the best helmet on the market. Here's a photo from a 100+ degree ride wearing this helmet and feeling nice and ventilated! I dig this helmet!

Feels like you arent wearing a helmet!
Unanswered Question

Is the Reson Blue really a grey color? Hard to tell by the photos...

High Quality

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

This new POC Octal X is a great option for those who have used the Octal helmet, but have been looking for a little more protection without sacrificing comfort or breathability. The straps on this are nice and heavy duty, so they won't wear out or tear in the event of a crash. I noticed that the actual shell of the helmet covers more area than the original Octal does, thus making it a bit more protective. All the favorite features and design of the Octal, in a new, dirt oriented package.