I don’t know how much protection a knitted cover would give, but I like the look of them and have been searching Ravelry for some good patterns:
Here are few I have in mind.
Two of these are in sock wool (ie 4 ply)
and the other in thicker 12 ply.
I am leaning towards to the beige 12 ply one as the cables look terrific and it would knit up pretty quickly. All of these are free patterns if you are a member of Ravelry