In reply to abcdef:
They are good enough for scotland in blizzard conditions. They are a fairly close fit, but let enough air through so they don't fog up. They look more like wrap around sunglasses than ski goggles.
One other advantage is that because they are relatively cheap, you don't have to be so precious about looking after them and in comparison to ski goggles they take far less space up and weigh next to nothing. Most DIY places such as Home Base, B&Q and all the builders merchants sell them. They often come in a variety of tints. Yellow being the best for dull flat light I believe.