Hahaha cheers for the quick reply. Basically I wanted the UA hood cause it looks simple and fuss-free. Basically you put it on and it stays there.
I'm currently using an airhole facemask and it works for the first hour or so then starts to slip or freeze up. Obviously it doesn't give much neck warming as well.
The Buff one looks good but I'm afraid it's much too similar to an airhole in that if it slips out from under your helmet at the back or in front under the strap, then you will have to remove your helmet and reset it.
I want something where you can pull down the face bit when riding lifts then just easily slide it back up once riding. The helmet tightness that you've described does worry me a little though but I suppose I will have to try it to find out? The fabric does look rather thin so I'm hoping it won't make too much of a difference to my helmet fit