PremierAcCovers Outdoor Air Conditioner Cover - Winter Breathable Tight Mesh Top AC Cover - 36x36 - BLACK Provides top protection during winter with its tight breathable mesh and does not cause rusting to your ac unit. This cover is NOT waterproof. We also sell Premier waterproof top covers Highly resistant to sunlight, mold, mildew, and temperature extremes. 5 year manufacturer's waranty. 100 percent satisfaction guaranteed