My son has a foot length of 21 cm and I ordered a size 3 Big Kid in grey. Unfortunately he cannot wear them. When he first tried them on and walked around, he said his pinky fingers hurt and the strap was falling off. The strap is actually Velcro, not a buckle (the buckle is a facade). I don't think they would have survived anyway. The sole is firm, but the fabric is weirdly glued, looks cheap (like felt with faux leather over it), and there is a slip on one of the foot straps, so there's an occasional hole in the middle. I do not recommend.
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