In reply to jaggy bunnet:
They aren't the most wind resistant trousers out there and they aren't fully waterproof either. To be honest they are a strange hybrid of soft and hard shell which just shouldn't work but bizarrely they do.
I wore them on just about every day last winter that looked like it would be mostly dry and they coped well! If it's going to be blowing a hooly I wouldn't want them to be all I had with me but they shed snow well, they are waterproof/windproof on the dark areas where would normally associate a need for waterproofing and lighter at back of legs, groin where you are less likely to get wet and where you benefit from a far more breathable fabric.