Measure Your Hat Size Use a soft measuring tape or a piece of string (not elasticized or stretchy). 1. Place the tape measure or string on your forehead and measure the circumference about 1/2 inch or so above your ears, about where your hat would sit. If you have another hat that shows the size, you can use that information instead. 2. Check the length of the tape measure or string to determine your size. (if using a string, hold it up against a ruler) 3. Use the size charts on the product pages to find your perfect fit. For example, if your measurement comes to 22 inches or 56cm, then you would choose a size Medium hat. *If you fall in between sizes, choose the next biggest size. If this is the case, please send us a note requesting inner size tape. We will send this along with your hat free of charge, just in case it’s just a little too big.