Tilley

Mens/Womens Hat Sizing Chart
Size 6⅞ 7 7⅛ 7⅜ 7⅝ 7⅞ 8 8+
Inches 21⅝ 22 22⅜ 22¾ 23⅛ 23½ 23⅞ 24¼ 24⅝ 25 26⅛
CM 55 56 57 58 59 60 61 61.5 62.5 63.5 66.5
Wrap a tape measure around you head just above your eyebrows to find your measurement.