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+1 on head shape VS helmet size.
I bought a Shoei helmet, size L, because that's what I normally buy and the dimensions matched my big melon head. Felt wonderful until 90-120 minutes, then could feel the pressure in the front. If I took the helmet off for 10 minutes or so, I could ride a little further before it happened again.
Seems like Shoei makes helmets for round heads, mines oblong. I like Shoei helmets though and I'd been eyeing another style, so I bought an XL, even though I thought it might be too large and loose on the sides, if it fit the length. Actually, fit great. Snug all the way around, no excess movement, and I have never felt the pressure or pain again. Doesn't feel like I'm wearing a water bucket and I can't spin it around on my head, so I think I'm good.