I asked them for dimensions of this EFX helmet and they couldn't give them to me. They just told me the following...
"Unfortunately, since this is made from the molds of the original prop, there is no size! It is based on the actor’s head!
However, it seems to be slightly narrower than the Boba Fett helmet. (If that helps!)
Thanks!"
I wish they cared enough to just measure it lol. Obviously it's made for the actor's head but that means nothing haha. I'm sure it should fit most. I just thought it would be useful info for anyone weighing options because this is really pricey. Awesome that it's from the molds... bummed that they won't measure it. I'm prob going to snag one anyway because of it's origin...