How Do I Know What Size To Get?

Average wigs fit heads from 21.5" to 22.5". Ninety-five percent of our customers fall into this range. Your wig should be worn on your natural hairline, approximately four fingers above the eyebrows. The back of the wig should be pulled down to the natural hairline in the back. Wigs have adjustable Velcro and elastic tabs in the back so you can adjust your wig for a secure, comfortable fit. There are also small tabs in the front of the ears that can be adjusted to hold the wig close to the face.

Source:https://www.yneed.co.uk/wig-faq/