AKA wank-sock, see sock-for-your-co.ck to purchase custom-made, premium quality, stain resistant, easy-wash pairs lovingly hand made to your very own design specifications.
I've used the same cock-sock for years now and it's become rather crusty. I think I will buy some more from sock-for-your-co.ck, they're great etc.
A cock-sock is a long athletic sock that a guy wears to keep his dick warm and his balls from receding when there's an Arctic Clipper like we sometimes get here at the Academy to keep his weenie warm.