*** Must have some bio (natural) hair for this grip model. The correct direction to wear it is with the hair velcro grippers touching your bio hair. For those without bio hair, we recommend all grip models from the S-Series (that have the letter S in the name) Features: Patent Pending Our innovative 3-in-1 wig grip was thoughtfully designed to maximize grip and comfort. Extra lightweight velvet wig grip Swiss lace front and part For extra grip, silicone strip on top and our innovative Hair Velcro Grippers on the underside Adjustable elastic strap in the back Measurements: Size S/M: 18.5-20 inches at widest elastic setting without stretching Size M/L: 19-21 inches at widest elastic setting without stretching Elastic can stretch an extra 2-2.5 inches past the smallest and widest settings Need help choosing the right grip for yourself? Check our FAQ section in the GripAfix section under Which model GripAfix is right for me?