Place the string or tape around your head about 1/8″ above your ear, across the mid-forehead, completely circling your head. Hold the tape firmly, but not too tightly. Basically you need to measure your head exactly where the hat will sit. If your measurement falls between sizes, choose the next largest size.
To find your size, measure the heel-to-toe mark and use the inch-to-size table. For example, if you are a man and your foot measures 10 1/4″ long, you will wear a U.S. size 9 shoe. If your measurements are between two sizes, or you find one foot’s measurement larger than the other, always move up to the larger size.