Wow, this stuff works! It goes on super easy, cost only $4.99 a bottle (plus shipping), and completely stopped fogging on the face shield of my motorcycle helmet. After application, I tried everything I could think of to get my face shield to fog up and the shield stayed completely fog free. I did manage to get my glasses to fog up a little by doing repeated heavy breathing but the glasses would clear as soon as I went back to breathing normal. The bottom line is that this stuff works great. Fogging problem solved.