Sunnydaze Air Conditioner Cover Square, Black Outdoor AC Unit Cover, 34 Inch Polyester UNIVERSAL SIZE: A/C winter cover is 30 inches tall x 34 inch square, so it is sure to fit most round air conditioners. ENGINEERED TO LAST: The heavy-duty cover is made from durable polyester with PVC backing for added dependability in the harsh outdoor elements. WEATHERPROOF DESIGN: AC cover is both waterproof and weather resistant, ensuring that it wont crack in wet or cold weather and will provide top level protection for you unit. TIGHT AND SNUG FIT: The high quality cover features a drawstring and toggle at the bottom for a secure fit. 1 YEAR WARRANTY: Sunnydaze Decor backs its products with a 1-year manufacturer's warranty for worry-free purchasing The side vents allow airflow to prevent wind lofting and mildew buildup causing rust while the cover is on your air conditioner unit. The extreme breathability of this cover helps prolong the life of your air conditioner unit and ensures it stays in working order.