Midwest Canvas 20x40 RECT SOLAR COVER 8 MIL BLUE/SILVER 20X40 RECT 5YRThis 20x40 solar cover traps heat and minimizes water loss, keeping your pool warmer for longer. The 8 mil thickness enhances durability while allowing sunlight to penetrate, maintaining comfortable swimming conditions. Its blue top layer absorbs solar energy, while the silver underside reflects heat back into the water. This dual layer design maximizes efficiency, reducing heating costs and water evaporation. Made from high quality, UV resistant