PremierAcCovers - Leaf Guard Summer Open Mesh Air Conditioner Cover - Keeps Out Leaves, Cottonwood and Debris 28x28 - Black Provides top proctection from leaves and debris buildup on your ac unit. Summer top covers are made of heavy duty, long lasting, open mesh material. Summer covers may be left on while the ac unit is running. All our Covers are made in America using American Materials and Labor. 100 percent satisfaction guaranteed.