Keep your 18′ round above-ground pool clean and leaf-free with the Swimline Leaf Net Above Ground Pool Cover CO918. This durable woven leaf net provides a 3′ overlap and stretches to 21′ diameter for full coverage. Made of black, UV-resistant mesh to let water through while trapping leaves and debris, it includes a cable & ratchet to secure the net in windy conditions. Reduces maintenance and spring cleanup by preventing debris buildup on your winter cover.