Headgear sizing:

Small - up to 21 1/2"
Medium - 21 1/2 - 22 1/4"
Large - 22 1/4 - 23"
Xlarge - 23" and up.

" DON'T DO IT FOR MONEY. Do it for the competition. There is no money in it, really, a credit card payment now and then." - Yvonne Reis