In reply to TheGeneralist:
You could try the latest incarnation of the BD half dome.
Had all previous generations, all in the m/l size, which gives me range to wear a hat/hood underneath or go commando.
Bought the latest version and this thing is humongous. So much so that it's been sitting unused with the tags still as I was unable to return it
Edit: if you can try it somewhere and it fits you can have this one for postage costs and a donation to mountain rescue. A shame for it to be gathering dust when it could be happily saving someone's noggin
Post edited at 09:19