Hat Sizing Tape will help you get the perfect fit for your Hat. Many types of inner bands do not allow for a draw strings such as leather, elastic or cotton with a foam lining. Hats without a draw string are adjusted by using Gigi Pip's Hat Sizing Tape (included separately). Hat sizing tape has long been the preferred method of adjusting hats because it allows you to keep the inner band in its natural form and the foam molds comfortably to the head.