Hjc Helmet Shields My 350$ HJC Motorcyle Helmet Keeps Fogging!?

My 350$ HJC motorcyle helmet keeps fogging!? - hjc helmet shields

I have a new number HJC $ 350 and Snell approved helmet (I had a 50% discount, so I to pay around $ 175) for my 50cc scooter.
Each time the mask is dropped and the breath from my mouth, then up helmet fog! And I am not able to see more!
What is the problem? There is a mist spray or what?
That really bothers me ... I must return the helmet? is a failure?
What must I do to prevent this?
Thanks in advance!