Hair Fibers are derived from a natural keratin source, and are statically charged to adhere to even the finest human hair. These Fibers have changed the lives of millions of men and women who struggle with fine, thinning hair. Look Thick Hair Fibers come in 18 shades of color and four size options. With so many color options to choose from, you might be wondering how to best pick the Hair Fibers color that will correctly match your hair color.