This is a chalenging one. I really love these Puma socks for my son. He had small's when he was about 18 months, and about shoe size toddler 5.  They are fantastic kids socks, great quality and they never fell off. Forget regular toddler socks from the baby store Puma made socks that fit feet. Note: my toddler wears wide width shoes.

The problem is now he needed a bigger size and I love these socks and knew I wanted them so I ordered online. In Amazon these are missing the size conversion chart. It lists the SOCK size not the SHOE size.  Who knows their kids' sock size - that is such irrelevant information. They need to add the corresponding shoe size to the listing in my opinion. I've added a picture of the tag for reference to size Medium which is also Sock 7-9.5 or also SHOE size 9-3.5.  That is toddler size 9 - boys size 3.5.

They are truly excellent quality socks, but this is just an unnecessary confusion about the sizing that they could have so easily clarified with some pictures of a sock to shoe size conversion chart.