How to know the size of my head?

When choosing a wig it is important that we know how long our head is or at least know if we are small, medium or large.

The medium size is the most common, which is 55-56 cm/ 22 inches in circumference. And it is what we call standard size that can easily be adjusted to a small head by adjusting the closures inside the wig or to a large size by opening the internal closures.