Measure your head where the hat would normally rest — about 3/8" to 1" above the eyebrowse as shown on the diagram. The tape measure should rest comfortably around the head — not too tight, not too loose.

Accuracy is important especially given in inches — ¼" or ½" can make a big difference.

If you do not have a flexible tape measure, a piece of cord or non-extensible ribbon can be used and measured afterwards.

If your head measurement falls between sizes, choose the largest. The hat will be more comfortable.