Made of statically charged natural, colored keratin protein that covers and color light to medium bald spots for both men and women! Its fibers seamlessly blend with your real hair strands for a completely natural look. Ardell Thick FX Dark Brown Hair Building Fiber is also effective on fine hair and balding areas to make it appear thicker and fuller. An excellent product to touch up gray areas of the hair and even out the color for a much younger appearance.