509 Delta V Commander Helmet Sizing

Getting the right size helmet isn't rocket science, unless it's the Delta V Commander! This helmet is special, because of the inflatable ear seals. I don't think there's another helmet like it in the snowmobile world.
Unfortunately, 509's own web site is of little use in trying to find the right size - their sizing charts are way out of sync with this helmet. I don't understand it, because it seems like such a simple thing to do - make the Delta V Command match up with the sizes on the web site.
Anyway, I hope this video helps people figure out the size they need. I also highly recommend seeing the helmet in person and asking a dealer to help you get the right size.

[@krankysledzz]

Nice little video.
I’d need a 3X , unfortunately they don’t make them yet.
Maybe next year along with sunviser and drop down sunglasses.

[@ponycarfan]

I hope they do add to the features. They've got a good helmet, I think. However, it could be better by adding things offered by other helmets. Their sizing is a little weird, too, and I don't understand why.

[@MotorcyclistMap]

Excellent video ..facing the same challenge .. did you come up with a video without the air inflates?

[@ponycarfan]

The season was so short that I never got a chance to try that.

[@MotorcyclistMap]

Your video was a game changer for me .. seriously as trivial it sounds, I was about to give up on the helmet for this very same reason .. thanks again

[@SiliconDrifter]

Can I use this for normal motorcycle riding?

[@ponycarfan]

509 makes a version of this helmet for street, and it’s called the Mach V. You can get that either with or without the Cardo integration.

[@SiliconDrifter]

@ponycarfan thanks. Do you know if the 509 ignite 12 volt battery will work with helmet?

[@0.Kiano.0]

Wish I saw this video before purchasing the helmet. God it hurts wearing it. Feels like it’s ripping my ears off.

[@ponycarfan]

That sucks. Are you wearing a balaclava? I wore the Fly Ignitor Air under the 509 helmet and that seemed to help. Otherwise, if there’s still too much pressure on your ears when wearing the helmet, try removing either the ear cups or the air bladders underneath the ear cups. Those are just held on by Velcro. The air bladders have little air hoses attached, but those are way to unplug. Worth a try, hope you can figure out how to make it fit better.

[@0.Kiano.0]

@@ponycarfan I tried the balaclava with no luck. The helmet itself just crushes my cranium and the rubber rims forcefully grab a hold my ears. I even noticed that my ears were bruised for a few days afterwards. Besides that, my bottom half was actually a perfect fit to this size.
Disregard 509’s size chart. I definitely recommend getting a helmet that’s one of even two sizes larger.
The website says it’s designed more for oval-shaped heads, but I’ve noticed the helmet has been more forgiving for riders with a more round-shaped head instead, despite it pushing their cheeks together as seen from various UA-camrs.
Truthfully, for any rider, it’s a hit or miss when it comes to the fitting of this helmet. I have an oval-shaped head, and like I stated, the original size I put on had already fitted to my lower half perfectly. I know for certain that if I go one size up, the lower half of the helmet will be too wobbly due to slack.