S - XL
 HAT SIZEINCHESCM
S 6 1/2 - 7 20 1/2 - 22 52 - 56
M 7 - 7 3/8 22 - 23 1/4 56 - 59
L 7 3/8 - 7 3/4 23 1/4 - 24 1/2 59 - 62
XL 7 3/4 - 8 24 1/2 - 25 3/4 62 - 65
SM - ML
 HAT SIZEINCHESCM
SM 6 1/2 - 7 1/8 20 1/2 - 22 3/8 52 - 57
ML 7 - 7 5/8 22 - 24 56 - 61
Universal Size
 HAT SIZEINCHESCM
UA 6 3/4 - 7 5/8 20 1/4 - 24 54 - 61
UW 6 1/2 - 7 1/8 20 1/2 - 22 3/8 52 - 57
Universal Youth
 HAT SIZEINCHESCM
UY 6 1/2 - 7 1/8 20 1/2 - 22 3/8 52 - 57
Universal Child
 HAT SIZEINCHESCM
UC 1/2 - 7 1/8 19 3/4 - 21 3/4 50 -55
Child
 HAT SIZEINCHESCM
SM 6 - 6 1/2 18 7/8 - 20 1/2 48 - 52
ML 6 1/4 - 6 7/8 19 3/4 - 21 3/4 50 -55


Head Circumference: Measure around your widest part of your head where your hat would fit comfortably.