Unhappy feet

A greater percentage of my socks
have holes in them
than those that don't.

The socks themselves are various ages,
black, white, or multi-striped,
and all levels of
thickness or thin-ness.

Why?

And how are holes formed
along the top
of the foot?
(Nowhere near the toes).
Three different socks have
holes along the top of the foot.
Five socks have holes
where the big
toe
goes.

I know what you are saying to yourself...
Darn it!
M