Improve Hair Health: this cordless and portable heated hair caps can be used on dry, damaged, curly, frizzy, long, natural, or ethnic hair types to help improve strength, volume, and manageability Easy to Use: before applying the cap to your conditioned hair, insert the heated cap into the microwave for about 1min. Increase by a few seconds if its not warm enough then place the heated cap onto the head for your desired time Cordless Design: the cordless design means you can work, rest or move around the house whilst applying your hair treatment. Reversible and reusable, they are designed to fit an average size head (21-24 inches) and can stretch up to 29 inches. The natural flaxseed interior retains even heat, achieving professional results in the comfort of your own home Consistent and Even Heat Distribution: this conditioning heat cap ensures heat radiating through the entire cap evenly and gently. Linseed is unique in the fact that it is one of the best options in retaining moisture and can be re-warmed time and time again