Eclipse Instant Hair Filler is designed for thinning hair areas and receding hair lines. Eclipse uses Microfiber Technology which creates a bond between your existing hair and the filler. The Filler is easy to apply and stays securely in place giving natural–looking thickness and fullness until the next time you shampoo. It won’t come off in wind, rain or perspiration. The Fillers are totally undetectable, even from as close as two inches.