Measure the circumference of your head where the hat will sit, typically about one inch above your ears and eyebrows. Use a flexible measuring tape and keep it snug, but not too tight. If you're between sizes, choose the larger size.

XS S M L XL
Head Measurement 21 1/4" 22" 22 4/5" 23 3/5" 24 2/5"
Standard Hat Size 6 3/4 7 7 1/4 7 1/2 7 3/4