Socks! You can never have enough cycling socks.
Lightweight, breathable, thin nylon/spandex blend hugs your foot and won't move around while you're riding.
A wicking antibacterial material helps to keep your feet dry and comfortable (and less stinky). Boyd Cycling logo pointing towards the back so people riding on your wheel know why you are dropping them!
One size fits all (unless you're a baby or a clown)