My head is 22.5" circumference, and I got an XL. It's perfect for me.How is the sizing for Waterproof? My head is 22.5 inches so I’m thinking a medium.
Edit: wow, that's off the chart. I wonder if it's changed since I got mine a couple years ago?
Edit2: DRIS still has a Waterproof sizing chart that puts L at 22" and XL at 23". LOL, you may want to buy locally and try it on first.