Keep your pool pristine when it's not in use all year long with the Bestway Round Pool Cover. Above ground pool covers are a must-have accessory; they keep debris, leaves and trash from getting in the water, and reduce the amount of chemicals you need to use to keep your water in tip-top shape. Featuring a rope to secure the cover, you can fit the pool cover to the exact size of your 18 ft. (5.49 m) round frame and 16 ft. (4.88 m) round steel wall pools, while feeling confident the cover will stay in place through most weather conditions. This pool accessory features drain holes to prevent the accumulation of water and stretching from the strain of the weight. This cover is the perfect accessory for a Bestway 18 ft. (5.49 m) round frame and 16 ft. (4.88 m) round steel wall pools.