I'll probably end up sending this helmet back. It claims to be a large but doesn't fit my gourd. It doesn't even fit Mielke's dome. It's a pretty sweet lookin' helmet as helmets go, but I'm sending it back unless someone with a smallish circumference speaks up this weekend and makes an offer. I'd say you'd have to be squarely in the Medium range - maybe even small for it to fit. If I had to guess I'd say it's a YOUTH large, but that is not how it is labeled...