I don't know what it is but once I do start removing hair it just doesn't stop. I do use a hair trimmer but I keep hair on my legs though since I am so pale (Someone today said I look as pale as the dead) and have dark almost black hair it stands out luckily I don't have too hairy of an upper body just a little around the nipples, and I have considered removing it but I don't know. Also I enjoy plucking my hair for some reason every now and then when a stray eye brow lash comes up I start and can't stop.