Midwest Canvas 15-Foot-by-30-Foot Oval Space Age Solar Cover | 12 Mil with 6-Pack of Grommets Bundle | Heating Blanket for In-Ground and Above-Ground Oval Swimming Pools EASIER TO MOVE - The included 6-pack of grommets are designed to allow water to pass through the solar cover when removing it from your swimming pool. This makes the blanket lighter to maneuver when manually pulling off or when using a solar reel to get your pool swim ready. As an added bonus, these grommets help anchor your cover by enabling some water to rest atop the solar blanket. This comes in hand with gusty wind conditions where the cover may billow up at times. WORKS AS GOOD AS IT LOOKS - The Midwest Canvas Space Age Solar Cover will help your pool become the envy of the neighborhood. The combination of attractive coloring and heat generating bubbles makes this a great investment. Use the suns rays to warm your swimming pool when not taking a lap. Enter the swimming pool confidently knowing the Midwest Canvas solar cover has kept the water warm just for you. Its easy to put on and take off allowing more time for showing off. MINIMIZE WATER EVAPORATION - The use of a solar cover helps in preventing up to 95% of pool water evaporation. When not enjoying a refreshing swim, keeping your pool covered lessens the vast amount of water lost into the environment. Fill up your swimming pool less and enjoy it more! HEAT RETENTION - After everyone has called it a day with wrinkled fingers from too much fun in the sun, make sure to place this solar cover back atop the water. Dont lose all of that warmth generated throughout the day when the sun sets. Assure your pools temperature does not drop too much by protecting it at night through use of a solar blanket. TRIM TO FIT - Your pool may be uniquely shaped and getting the right fit is as easy as finding a marker and sharp pair of scissors. Have the bubbles facing down to the water and trace a line on the cover showing where you should cut off the additional material. Do so confidently knowing this wont affect the manufacturers warranty---they understand.