scalloped elastic?

Does anyone know if such a thing exists. My son has a pair of socks that has - what feels like - scalloped elastic (i.e. rick-rack shape). I might be mistaken, and it may just be how the elastic was sewn but there is a distinct curve to the socks. These have stayed on his feet remarkably well. I was thinking of sewing them on all his socks.

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RLK
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Beth Pierce

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