Hmmmm, interesting. I also have the problem with my helmet sliding forward when I am low on my bike, effectively not allowing me to see as much as I would like and slowing me down around corner. The back of my helmet hits the hump on the back of my leathers pushing the over my eyes. I don’t see why the designers are not able to remedy this problem, by either opening the top of the visor area more or contouring the back of the helmet more or both. I don’t know why I didn’t think of adding foam into the top of my helmet. Sounds like a simple but effective way around it. I will be going out to buy foam now.