I bought size 4T-5T for my 3 year old son (soon to be 4). I washed and dried them with a regular load of whites and now they are WAY too tight. They fit as far as foot size, by they're extremely difficult to get on, and they leave deep imprints on his ankles and legs. He's very tall for his age, and very thin, so it's not like I'm trying to shove these socks onto little sausage feet. After wearing them only a couple times I threw the whole bunch in the trash and let him go back to his more comfortable ankle socks.