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.

k,sk,[k]14,
[k]16,
k,sk,k,sk,[k]12,
[k]16,
k,sk,k,sk,k,sk,[k]10,
[k]16,
k,sk,k,sk,k,sk,k,sk,[k]8,
[k]16,
k,sk,k,sk,k,sk,k,sk,k,sk,[k]6,
[k]16,
k,sk,k,sk,k,sk,k,sk,k,sk,k,sk,[k]4,
[k]16,
k,sk,k,sk,k,sk,k,sk,k,sk,k,sk,k,sk,[k]2,
[k]16,
Repeat last two rows as many times as you wish, I did it seven times.
k,sk,k,sk,k,sk,k,sk,k,sk,k,sk,[k]4,
[k]16,
k,sk,k,sk,k,sk,k,sk,k,sk,[k]6,
[k]16,
k,sk,k,sk,k,sk,k,sk,[k]8,
[k]16,
k,sk,k,sk,k,sk,[k]10,
[k]16,
k,sk,k,sk,[k]12,
[k]16,
k,sk,[k]14,
[k]16

Made with Orangellous’s chart generator