Kwik Thick gives you instant results. In less than 30 seconds, you can have thicker fuller hair. The natural keratin fibers, attach to your existing hair and are resistant to sweat, rain, and wind, but come off easily with shampoo. Kwik Thick blends easily with natural hair and comes in seven shades: black, dark brown, medium brown, light brown, blonde, gray, auburn and blends easily for perfect match. You want to go one shade darker, giving your hair the fullest look. It is completely undetectable.