Love this helmet. Tried on lots of different one's from Arc, Camp, Petz, etc.... and the half dome was the only one that fit well no matter what was on my head. I have a pretty big head (71/2) and this was the only one that was still comfy with a heavy fleece hat or balaclava under it. Others were all too tight with layers on. If you have a small head this might not be quite as good for you, although it also had the easiest, quickest, smoothest adjustment ratchet. Would have given it 5 stars, except I have only climbed in it a few times, and I'm not sure how it will perform long-term, and it also is a bit spendy. For me it was well worth it. I hate headgear that it too tight, especially on all day climbs.