I’ve bought two sets of these socks. I got a vibrant color set Winter 2021 and they fit snug but not too tight, just the way I like. I wear a 6.5-7.5 shoe in US sizes. This second set I just received in darker/subtle colors fits much looser in the heel than the set I bought in Winter. Some shoes they bunch up in the back. I love them for shoes that come to the ankle, but they aren’t truly "no-show”. They show with loafers/slip-one’s (like Toms/Bobs). I would say these are medium thickness. Overall, I still really like these but feel sizing is inconsistent.
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