I have a screen cover with ear muffs it also covers the front door side windows. It has corner pockets to pull over the door corners to keep it taught. It is fairly robust and made of some sort of canvas possibly synthetic. I think that they may be available in various colours or even have humerus printed designs. Should be able to see them on the www usual places. The also afford good privacy when parked up. they are quite easy to put on compared to a full pullover cover. So the whole front window glasses and mirrors protected from frost all in one go and minimal effort.
Available with attached mirror ear muffs covers front door side windows also. Fairly easy to put on. Has little corner pockets to stretch over the corner of the front doors that holds the whole lot fairly tight and flap free.
Don't know what happened there, did not publish so wrote again only to find it printed on return.
i actually can not find my front canvas cover. i just thought that i would check to see the mirror covers as I see on line non had ear muffs. I have been using a full cover lately. So I will have to have a search tomorrow and see that i was not imagining things the ear about ear muffs. Ummmm, in any case it would be easy to run something up on a sewing machine I guess.