HEAD: To figure out your UA fitted hat size, measure the circumference of your head where your hat will rest. If you don't have a tape measure, use a string and measure it against a ruler. Find your measurement on the size chart to determine your ideal UA hat size.
MEN'S OSFA 56 - 60
S/M 53 - 55
M/L 56 - 58
L/XL 59 - 62