Outdoor Research Headware Size Chart
Small Medium Large X-Large
US Hat Size 6⅞ 7⅛ 7⅜ 7⅝
Inches 21⅝ 22½ 23¼ 24
Centimeters 55 57 59 61
These are general guidelines only, sizes are not guaranteed. But no worries, since at SunnySports we offer our exclusive PFF Guaranty