Size Chart - Outdoor Research Hats

Small Medium Large X-Large
US Hat Size 6¾” – 6⅞” 6⅞” – 7⅛” 7⅛” – 7⅜” 7⅜” – 7⅝”
Circumference 21” – 21.75” 21.75” – 22.5” 22.5” – 23.25” 23.25” – 24”



ONE SIZE S/M L/XL
US Hat Size 6¾” – 7⅝” 6¾” – 7⅛” 7⅛” – 7⅝”
Circumference 21” – 24” 21” – 22.5” 22.5” – 24”

Measure around your head where the headwear would fit comfortably.