Zip up knee-high socks by Leg Avenue
I thought these were boots when I first saw them on the ASOS website, but nope, these are socks, folks, which begs the question: what do you think of them? I guess the fact that they do look so much like boots - albeit very skintight ones - could make them appeal to those of us who never can find knee-high boots to fit our legs, properly, but, not being a bit fan of exposed zips, I don't think these are quite my style.
If they're very much your style, however, you can find them for £16 at ASOS, who are currently carrying quite a wide range of unusual socks and tights in preparation for winter.
Related: More socks and tights