Support - Hat Sizes back to Support Topics We carry FlexFit Hats. The sizing chart is as follow; Sizes: S/M - 6 3/4 to 7 1/4 L/XL - 7 1/4 to 7 3/4 Was this helpful? Was your support issue answered? Note: This form is for feedback on this support topic only, not support questions. Would you like to open a Support Ticket? Thanks, we appreciate your feedback!