Custom-fit frost covers made from DeWitt's heaviest 2.5 oz frost cloth, rated for 10°F or more of frost protection. Sewn in Tucson to fit your raised bed, your potted citrus, or your whole tree. Zippers, magnets, drawstrings or stake-down grommets seal out the cold air, so there are no clips, no bricks, and no sheets blowing off at 2 a.m.