All of stock is standard medium, it is 22.5 inch. And it has adjustable straps. Normally it can match the head of most people. If you have a very large/small head (only for 360 wig, full lace wig can't be customized), you can leave a note in your order for that,We currently provide you with free customized services, but it needs 3-5 more days to be shipped out.Note: Custom products do not accept return or exchange service.