Hockey socks work too, if you want covers.
However, if there's a chance of airborne dirt particles (moored near a gravel lot and windy, for instance) the covers can trap and hold dust/dirt and then become hull abraders themselves.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"