SIZE BREAKDOWN (in inches):
XS - (6 3/4) = 21"S - ( 7 ) = 21 1/4"M - (7 1/4) = 23"L - (7 1/2) = 23 1/2"XL - (7 3/4) = 24 3/8"XXL - (8) = 25 1/4"