Adult Hats*
    S M L XL
Head Size 21⅛-21.5 21⅞-22¼ 22⅝-23 23.5-23⅞  
Hat Size   6¾-6 7-7⅛ 7¼-7 7 1/2-7⅝  
* In order to achieve the accurate sizing figure please measure around the largest part of your head, with the tape measure just above the brow.