They are acrylic so warmer than cotton but they are quite thin nothing like the nice warm socks I bought 10 and 20 years ago . However, they seem to be the only acrylic paints currently available, so I'll have to settle for them as my old ones are wearing and getting holes. I bought both the large and the extra large and ended up returning the large and keeping the extra large. As my feet are on the small side (shoe size 6.5) I think they will be too small for most adults.
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