Great shoe. My son is a size 3 in Adidas,Under Armour, and Nike. I assumed all shows ran similar to size, but they don’t. I still got a kids size 3 they fit big but he says they are comfortable and will grow into them. A 2 1/2 would have been better but I don’t remember if it runs in 1/2 size. He is a 7 year old so it’s a bit hard to get used to using the heelys. Overall he loves them!