Two options to install, either insert the tabs between your window and car door panel, or use the sticky back self fastening tapes. Choose the best option to fit your car. You can roll down and up the windows when installed with the self fastening tapes. Stays in place and no worries about scratching the window. Waterproof and No PVC, safe for your pets. Machine washable. Self fastening tape at the bottom to stop flapping in the wind. Includes 2 covers, one for the left door and one for the right. 28'' Width X 22'' Height, one size fits all. LIFETIME SERVICE. We offer lifetime service for our pet seat covers. If you have any concerns with our products, please contact us.