TOPPIK Hair Building Fibers instantly transform the appearance of thinning hair. Made from natural, colored Keratin protein, these fibers blend undetectably with existing hair, creating the appearance of naturally thick, full hair. Resistant to wind, rain, and perspiration, TOPPIK stays in place all day. Easy to apply, it’s the perfect solution for both men and women seeking to conceal areas of hair loss or thinning.