I have a standard Buff, I wear it pretty much all the time (I'm wearing it now) and sometimes even wear it to bed if I forget to take it off.
I was going to get the Merino wool one as well, but after wearing this one to walk up the fields and when I get working in it I think I might boil in the merino wool, so sticking with this one for now.
I can pull it up over my head but do fine it chokes me a bit after a while, it's nice and thin under my hats though.