Took the metal off and used them to cover the pickup windscreen in the bad weather, bit smelly but stopped the door locks freezing as well as keeping all windows clear of ice
I use mine to insulate my Guinea Pig hutch- an old stable rug on top, covered with an old turnout, then two old turnouts wrapped around the sides and front at night time. (hutch is 5ft long by 2ft deep, with its back to a wall- is felted anyway but the rugs give them extra warmth!)