The R.A.D® General Sock triple pack. Not much more to it.

Sizing:

Small: M 5 - 8 / W 6.5 - 9.5
Medium: M 8 - 11 / W 9.5 - 12.5
Large: M 11 - 14 / W 12.5 - 15.5

If between sizes, size down.