S (6 7/8") M (7 1/8") L (7 3/8") XL (7 5/8") XXL (7 7/8")
Interior Circumference 21 5/8" 22 1/2" 23 1/4" 24" 24 7/8"

Don't know your hat size? Here's how to find out. Wrap a cloth measuring tape or string around your head at the point at which your hat normally sits (~ 1/2" above your ear and across mid-forehead). Pull the tape or string tightly enough to get an accurate measurement, but not uncomfortably so. Take the measurement and match it to the next largest interior circumference listed above.

A word of caution: Most men actually wear a size large hat instead of a medium. Just because you are a medium in pants, shirts, etc. doesn't mean vour hat size is a medium too!