HAT

XS XS S S M M L L XL XL
US 6⅝ 6⅞ 7 7⅛ 7⅜ 7⅝
UK 6⅜ 6⅝ 6⅞ 7 7⅛ 7⅜
Europe 52 53 54 55 56 57 58 59 60 61