One size fits all – Total Length: 25″ long / Gel Portion 19″ Clear hypo-allergenic gel band Can be used under hats and wigs Can be cooled (ie. refrigerated) for a cool layer of comfort Hand wash in warm water with gentle soap. For maximum comfort, the adjustable COOL GRIP band provides an easy and secure fit, so you can stay cool while pursuing your favorite activities - headwear optional. Relax knowing that its hypoallergenic gel material is easily washable and can be cooled for extra relief on hot days.