Arctic Armor Pool Cover Features. Protected rugged polyethylene scrim and coating means this cover can withstand winter’s worst and last for years in direct sunlight. Arctic Armor’s black underside blocks the sun to prevent algae growth and the heat sealed seams help ensure a crystal clear pool next spring. The big 4 ft material overlap ensures a proper fit and helps the cover from stretching and ripping like covers with 3 ft overlaps. Cover is held strong and secure with the included heavy duty cable and winch system. Available in your choice of 4 material colors: Graphite, Dark Green, Royal Blue, and Gray. Replacing your old, worn out winter cover protects your pool investment and keeps your back yard looking sharp during the winter months! Choose your material grade and pool size from the drop-down menu above. Gorilla winter covers include Triple-Layer Construction for rip-resistant, long lasting durability and an additional rugged border scrim to ensure that the grommets hold secure and the cover stays put! Pool Size: 12′ Round = Cover Size Approximately 16′ Round. Pool Size: 15/16/’ Round = Cover Size Approximately 19′ Round. Pool Size: 18′ Round = Cover Size Approximately 22′ Round. Pool Size: 21′ Round = Cover Size Approximately 25′ Round. Pool Size: 24′ Round = Cover Size Approximately 28′ Round. Pool Size: 27′/28′ Round = Cover Size Approximately 32′ Round. Pool Size: 30′ Round = Cover Size Approximately 34′ Round. Pool Size: 33′ Round = Cover Size Approximately 37′ Round. Pool Size: 36′ Round = Cover Size Approximately 40′ Round. Pool Size: 12′ x 17′ Oval = Cover Size Approximately 16′ x 21′ Oval. Pool Size: 12′ x 20′ Oval = Cover Size Approximately 16′ x 24′ Oval. Pool Size: 12′ x 24′ Oval = Cover Size Approximately 16′ x 28′ Oval. Pool Size: 10′ x 20′ Oval = Cover Size Approximately 14′ x 24′ Oval. Pool Size: 12′ x 28′ Oval = Cover Size Approximately 16′ x 32′ Oval. Pool Size: 15′ x 26′ Oval = Cover Size Approximately 19′ x 30′ Oval. Pool Size: 15′ x 30′ Oval = Cover Size Approximately 19′ x 34′ Oval. Pool Size: 16′ x 25′ Oval = Cover Size Approximately 20′ x 29′ Oval. Pool Size: 16′ x 28′ Oval = Cover Size Approximately 20′ x 32′ Oval. Pool Size: 16′ x 32′ Oval = Cover Size Approximately 20′ x 36′ Oval. Pool Size: 16′ x 40′ Oval = Cover Size Approximately 20′ x 44′ Oval. Pool Size: 18′ x 30′ Oval = Cover Size Approximately 22′ x 34′ Oval. Pool Size: 18′ x 34′ Oval = Cover Size Approximately 22′ x 38′ Oval. Pool Size: 18′ x 38′ Oval = Cover Size Approximately 22′ x 42′ Oval. Pool Size: 18′ x 40′ Oval = Cover Size Approximately 22′ x 44′ Oval. Pool Size: 21′ x 41′ Oval = Cover Size Approximately 25′ x 45′ Oval. Pool Size: 21′ x 43′ Oval = Cover Size Approximately 25′ x 47′ Oval.