I bought these in August 2018 for my daughter to wear in K4 (then). Just now I finally got around to ordering another 12 pack. During this time I changed all 12 pairs. Only occasionally did she wear socks, which have largely retained their shape and thickness. I noticed that one or two started to stretch and the fabric thinned. I've always washed and dried them normally with whites and that wasn't a problem. But since the underside is more difficult to clean, I figured it was time to replace it. I will most likely buy the same size (she's a 10 to 10 1/2 baby depending on the brand) because she's still fine. They come just above her knee. For such a price we got a lot of useful things from them.
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