I ordered the boot socks a size larger based on the reviews (20). But the socks were too big. The problem wasn't necessarily the length. In order for these socks to fit my daughter, they would have to have very round feet, otherwise there is fabric overhanging on the left and right. The length to width ratio is just not right. I find that absolutely uncomfortable. I also didn't find them particularly elastic. I would not order these socks again. We chose Sterntaler and are very satisfied.
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