Pin-lock system.......
A drop or two of dish soap applied to the inside of the faceshield will work, but will need to be re-applied regularly every few days. Apply w/ fingers, buff w/ microfiber towel.
Where is it THAT cool already?
I first used a Pro Grip Shield - I liked it and it worked well. I changed helmets and went to Fog City because it was all I could find on short notice and it just plain sucked.