This umbrella cover is suitable for protecting your parasols and umbrellas from dirt, wind, rain and UV light year round. The cover is made of durable polyethylene, which is waterproof, UV-resistant, tear-proof and thus can withstand outdoor adverse weather conditions. It helps to protect the umbrella's appearance and structure, therefore extend its service life. The zipper makes parasol cover easy to fit and the drawstrings inside help tighten and prevent the cover from being blown off. Note: This product is not 100% waterproof. So, we recommend you to treat it with a waterproof spray for a better waterproof function.