The Budge Standard class A RV Cover has a top panel that is made from a 3 layer water resistant spunbond polypropylene. Single layer side panels are durable and lightweight, making the cover easy to handle. This cover also includes full height zippered panels, so you can access your RV while covered. The Standard RV cover will protect against sun, dirt, occasion rain and heavy dust. Air vents are included on the top of the cover to prevent billowing. This cover comes with a buckle system and elasticized bottom corners. Cover is breathable and UV treated.