Ok, first, this does do what it claims. It really does fill in where your hair looks thin. However, its noticeable to others unless your hair is exactly the same color as the fibers (which is really hard to match). My hair is sort of red, sort of dark blonde, but its a natural color and those are really hard to match from the options. I've tried the light brown, the blonde, the light auburn. They all worked and did what they said they would do, but I felt like people could tell (and someone did ask me what was in my hair once). So if you're looking for something for maybe photos or a dark night out, this will work and look fine. For everyday, I'm not so sure.