When using a 20* quilt what do you use to insulate you head? I know putting the quilt over your head is not a very good idea, especially if its down. Well Ive been toying with the idea of hacking up my 20* down bag (really 30* since its a bit under filled) but wanted to find a way to insulate my head before I thought more into it. I probably wouldn't be able to get a true 20* rating but I'm thinking I should be able to get it a bit lower since I don't plan to take any down out and I planned stuff use the down from the hood and draft tube.

Anyhow Ive been thinking of getting a bomber hat but wasn't sure what other options where out there. So what or quilt users using to keep their heads warm?
My gear is no where near lightweight