I bought size 2-4t for my 2 year old who (usually) wears size 8 sneakers. They fit my daughter well but not much room to grow. I would say if between sizes, go up a size. In principle, what can I say, these are normal socks. They're pretty thin so keep that in mind. For the winter this is not the best choice. Here in Texas they will work just fine. They are generally of good quality. You get what you pay for. They are fine and doing their job. For the price I wasn't expecting much at all. I would give them 3.5 stars if I could because the price was very good. What I will tell pros is that they are nice and soft and hold up well too. The length is something between lengths. It's a bit strange. Not big enough to be tall, but not low enough to be short either. I can fold them up and cuff them to wear them like this.
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