I wear a 6 7/8, and got the S/M size. That's the size I normally wear. This hat feels tight and hurts my head. I won't be wearing it. I saw other reviews that said to go larger, and they were right.
greg h.
The lg/xl size fits too tight for Xl (7 1/2) head.
DAVID K.
damn good hat. well made and a comfort to wear. plus.... it's infantry.