Adjustable Head Circumference & Head Circumference Measurement
Easy to adjust head circumference, suitable for head circumference: 56-60cm/22-23.6in. Freely adjust to the size that best suits you.
Measurement method: bypass the forehead in the front and the position where the back of the head bulges, and don't be too loose or too tight. The best measuring tool is a soft ruler or a tape measure. If you don't have it, you can compare it with a rope, cloth strip, etc., and then measure the length of the rope or cloth strip.
