I bought these during a recent very cold snap to wear, (in wellies), when out lakeside fishing. I just cannot count the number of "thick" socks I have accumulated - none of which actually keep my feet warm. These socks are superb, and keep my feet really cosy whatever the circumstances. I even took a pair to Switzerland for use on a couple of 2,000 metre adventures ... and I experienced no discomfort at all! My most meaningful accolade? I bought a second pair.