joshmolloy wrote: In my opinion it's like this:

standard screen - comfortable on the road, all air directed to your shoulders
double bubble - directs air straight into your helmet when road riding (sat up) but gives you space to get into the bubble in a racing crouch on track.

I reckon the idea of double bubble screen being a comfort thing for road riders is a common misconception.

"flip-up" screens on the other hand would work I reckon.