I had to buy three pairs to get one the right size. My daughter wears size 1 outdoor shoes (also Nike which run small) and size 1 was spot on. I also bought a 1.5 and 2 based on reviews and the size 2 pair were literally two different sizes. They're soft and fit in length, but they're still quite loose despite not actually having narrow or skinny legs. Although they will work.
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