Step 1 - Use a Piece of String to Measure Your Head: With the piece of string in your hands, wrap it around the back of your head just slightly above your ears or about 1/8 of an inch higher than your ear tip.
Step 2 - Measure the String with a Ruler: Once you have marked the point of circumference on the string, you can lay it flat and place a ruler underneath to find the circumference in inches. You will likely have to measure the size to the nearest 1/8 of an inch.
Step 3 - Match the Circumference to the Hat Sizing Chart: Once you have used the string or head measuring device to find your circumference, you'll have the exact measurements needed to use with the hat sizing chart.
*This sizing chart measurements are closest approximation with a 1/2 inch variance.