These. http://www.planetx.co.uk/i/q/CLOOTKMS3P/on-one-thicky-merino-socks-(3-pack) Am looking for some warmer socks for winter. Anyone used them? How thick/warm are they actually? I note that they are not actually 100 per cent merino (you have to be careful checking the fine print with merino stuff) but this maybe (?) doesn't matter so much with socks as, unlike base layers, I will only be wearing them once and don't need the enhanced pong resistance.