The Toppik Hair Building Fibers instantly fill in balding or thinning areas. Made of pure organic protein, Toppik is completely undetectable and resistant to wind, rain and perspiration; yet easily washes out with shampoo.In an industry plagued by companies making empty promises, Toppik stands out as the one product tested by consumers and dermatologists, endorsed by hair loss physicians, transplant surgeons and medical centers.