Cover Your Gray Fill-In Fiber is an instant coverage fill-in fiber with Procapil. Sprinkle on to thinning areas for instant coverage, lasts all day and when done simply wash out with any shampoo! Fill-in Fiber contains small microfiber hairs that instantly adhere to the hair root, blending amazingly to help conceal thinning hair and bald spots. Simply shake the product directly over thinning areas of hair to disperse these small fibers into thinning areas for an instant fuller, thicker appearance of hair.