YourSecretStyle is made of 100% hair-like, dyed, rayon cotton fibers that are charged with electrostatic energy to adhere to hair. The fibers look natural because they literally bond to your existing hair. YourSecretStyle will not harm your scalp or hair. It is safe for men and women of all hair types/ages; even colored hair. The hair thickness created is realistic. Also, the fiber can be incorporated into most hairstyles and there are several colors to fit any customer's needs. Any extra YourSecretStyle fibers that go on your shirt or pillow, can just be dusted off with your hands. YourSecretStyle is sweat resistant and will not smear or run, even in light rain. It will last until you wash your hair with shampoo.