Above Ground Swimming Pool Winter Tarp Covers by Swimline in Round and Oval Sizes. Swimline above ground swimming pool winter covers combine expert craftsmanship with state-of-the-art materials to bring you high-quality, heavy duty pool covers at the right price! Years of proven experience ensure a reliable winter cover that you can count on! Choose your model and swimming pool size above. Solid winter cover material that keeps rain water and debris out of your pool, ensuring an easy spring opening next year. Metallic grommets with a provided cable and ratchet system to lock your cover into place. Double stitching to stand up to high winds. Generous full 4 overlap for ample coverage. Black underside cover color to prevent algae growth. Deluxe Series Blue SuperGuard cover model. Dark blue top color. Tightly woven laminated polyethylene sheeting with thick, high-density stitching and 8×8 scrim per inch. Super Deluxe Series SilverKing cover model. Treated for resistance to damaging ultraviolet rays. Heavy duty 12×12 scrim increases durability. RipStopper Series Green covers. The strongest winter cover on the planet features completely rip proof patented technology. Advanced manufacturing process yields 3x normal tear strength of other winter covers. Super strong brass grommets for years of reliable service.