A Study In Socks: Arch Support?

I’ve recently noticed that one of my favorite pair of running socks has this interesting feature on the sole that I think is for arch support. It’s all two-tone and looks exceptionally complicated, but it’s fundamentally just a trapezoid of slipped stitches.

This is my rendition of it:


Knitting instructions after the break. Meant for a sock in the round.

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