As I walk or run up the hill in the morning, catching the bus to work, I discover to my dismay that my socks are getting lower and lower inside my boots, and bunching up around my feet. This rapidly becomes uncomfortable.
Why does it occur? Obviously there is some sort of differential pulling action on my socks. I can see that down is the easiest way for the sock to move; at the outset it can’t be pulled up, for instance. But it seems that the top, at least, could still theoretically be rotated sideways. And why ould there not be a motion later that would pull it up?