Toppik Hair Building Fiber instantly make thinning hair look thick and full. It’s Keratin fibers cling to existing hair and in seconds fill in all thinning or balding area. Toppik won’t come off in wind, rain or perspiration. It is totally undetectable, even from as close as two inches. All you will see is thicker looking hair! Try our toppik medium brown to match your brown colour hair today !