Okay for price, 5 stars, if you want a sub £5 mask you can stop reading this review now and know that it is the best one you'll buy.
However I would urge you to stretch your budget a little bit and buy a full silk balaclava. As a winter motorcyclist I know how bad the cold can get. I personally use both this mask and a balaclava (Handy sowed together). This works brilliantly.
My main problem with this is that trying to get a helmet on over it often catches the nose and slides down. This is where a balaclava comes in useful, it also has no protection for the back of you neck and does up behind your ears, pictures are a bit misleading here as it looks as though this is not the case. Clever photography I guess.
No worries, buy it don't buy it either way you won't waste your money. It works well with something else. I just wish I could spend £15 for something I could wear off the shelf with no modifications and not get a cold neck!