HALF-OPEN USE This porch cover for winter has 2 zippers, open the zippers and lift up the whole part to back for half-open use, which allows you to keep the dust out and still use the swing. NORMAL WEATHER USAGE The patio swing cover is made of high quality 420D oxford fabric, which is waterproof, UV-resistant, fade-resistant, tear-resistant, dustproof, etc, prolonging the service life of the swing.