Always Keep Pool Water Clean This pool cover is made of upgraded 500D high quality waterproof material, with waterproof sealing strips on all the top seams, which effectively blocks rainwater from seeping in and pool water from overflowing, keeps dirt and leaves away from the water, makes the pool water cleaner, reduces the number of times you need to clean and the use of chemicals, lowers the cost of maintenance, and saves you money and effort.2025 Upgraded Windproof Design Our summer rectangular pool cover has two patented tightening ratchets inside to help users quickly install and remove, with the pool cover edge load-bearing hanging rings (can hang sandbags/heavy objects), you can tie it directly to the frame or hang heavy objects at the edge of the pool, so that the cover is always in a stable condition, no need to worry about the windy weather!Safer & Eco-Friendly MaterialOur pool cover is Amazon Friendly Climate Certified and made of odourless, eco-friendly PU clear material that is safe for children and pets in hot environments, won't melt or leave a black residue, and is safer and more environmentally friendly than traditional PVC. Let you and your family enjoy the whole summer.Upgraded Tear Resistant DesignThe edges of our rectangular pool cover are designed with a lay-flat seamless design (no risk of edge cracking compared to traditional double stitching). Upgraded 500D Oxford fabric has a tear strength of 330 lbs (lab test), which increases the durability by 3 times, far more than 420D/210D fabrics, ensuring the pool cover is stable for long-term use.UV Protection&Insulation PU-coated 500D fabric blocks 99% of UV rays (UPF50+ certified), protecting the pool water and cover from sun damage and preventing algae growth. Black fabric absorbs heat to raise water temperature by 8-12 degrees Fahrenheit during the day while reducing nighttime heat loss by 95% - dual-mode climate control that outperforms silver-coated pool covers.