will fit a 24" head no problems at all, though I can't say about visor interference yet
24"??? That's a huge head.
From my experience 23.5" is about average for an adult male head as that's what most helmets and cowls are made to. So 24" isn't that big?
24" around the circumference of the widest part of the head is the usual way to measure.Wait... are we talking 24" wide or 24" tall?
This has me very excited, I hope I can afford one.