"FROST KING" WINDOW AIR CONDITIONER COVERHeavy-duty reinforced 6mm polyethylene helps protect air conditioning units from damage caused by winter conditions. Reduces drafts and heat loss. Comes with elastic strap for a tight, secure fit. Will not crack or mildew.Highlights:Polyethylene For Window Units Fits 10,000 - 15,000 BTU Units 27" x 18" x 22"