To find the right size, you should measure the circumference of your head using a tailor's measuring tape. If you don't have one, you can use a piece of string or a cord and then measure it with a flat ruler.
The measurement should be taken at the level where a hat normally rests, which is one centimeter above the ears, and on the forehead, one centimeter above the eyebrows. When taking the measurement, hold the tape measure firmly but loosely.
