Toppik is crap. Nanogen is much better. Last week I ran out of nanogen but still had some old Toppik and i remembered now why I switched. Nanogen sticks to the hair, and gives it more density while toppik looked like sawdust on my scalp. In in wind the Nanogen stays there, the Toppik blows away. When I use Toppik, it's like I have sand in my hair. Nanogen looks more natural and a little rain won't affect it. I can forget about going out in the rain with Toppik. It runs off so easily.