In reply to Bob: I've found sealskinz socks v. cosy for winter fell running. Even when you go thro' a river over the top of your socks, they act like a wet suit and keep your feet warm.Only drawbacks I've found are: a: if your toe nails grow you get a hole in the membrane-oops! b:no matter how I wash them, they always stink! c:when they get really wet- as in a mountain marathon, you end up carrying an extra kilo of smelly water around in your shoes.Interestingly, I have an old pair of the gloves,which I find quite cold,and they seem to get v. sweaty and clammy.