I ordered the size for 2 years, because this size is worn by my 19-month-old son, 2t. He's wearing size 7 shoes. They're a little big but I just have to tighten them up a little bit, which is really perfect because then they cover his leg a little bit more. The sock grip is great so far. You wash well. I recently bought a pair of Hanes socks thinking it's a good brand they will be good. They had a very poor fit, were big and baggy and ended up falling off which really annoyed my son so he just took them off. Not well since January and we live in Illinois. They're not that thick, but they're not too thin either, just right. I will definitely buy again. Highly recommended.