Protect your pool during the winter with the Robelle 3733-4~Supreme pool cover. This durable cover blocks UV rays and prevents the growth of harmful algae. Made with durable polyethylene material, it keeps dirt and debris out of your pool. Thermally sealed seams ensure its performance throughout the season. The cover features a 5-foot overlap for easy and complete coverage. Includes an 8-year warranty. Durable water tubes provide additional stability (sold separately). Available in different sizes and weather-resistant.