WHAT IS Hair Fibers Is a safe, natural, and undetectable way to improve the appearance of thinning hair without harmful drugs, chemicals, or surgery. Its microfiber hairs are made of colored keratin protein to blend and instantly and create the appearance of naturally thick and fuller hair. Its microfibers stay firmly in place through wind, rain and perspiration for longer-lasting results. These tiny microfiber hairs are electro-statically charged to form a magnetic attraction with your existing hair - however thin - and blend perfectly to conceal the appearance of thinning and balding in seconds. With several, color-matched fiber choices available, you can conceal thinning hair on any natural hair color.