Cover any pool shape without a custom order using this 12-MIL trim-to-fit rectangle pool cover, which combines cleanly-cuttable PE construction with 4 pre-cut size options (12 ft. x 24 ft. / 16 ft. x 32 ft. / 18 ft. x 36 ft. / 20 ft. x 40 ft.), dual-side heat-retain-plus-debris-block function, and above-ground or in-ground compatibility for real DIY pool cover customization. The trim-to-fit framing is the DIY standout versus fixed-shape covers: kidney pools, freeform backyard builds, and custom hardscape outlines can't match pre-made covers, but this PE blank cuts cleanly with household scissors so you can trace your actual pool outline and trim for a precise fit. 4 pre-cut starting sizes minimize trim waste - pick the rectangle closest to your pool footprint. Premium 12-MIL PE construction is sun-proof, anti-tear, anti-aging, non-toxic, and safe for residential pool water, outlasting thin 8-MIL covers. Dual-function design delivers bubble-side heat retention (raising water temp, reducing evaporation by 95%) and debris-side protection (leaves, dust, insects) without product layering. Suitable for both above-ground and in-ground pools of rectangle, round, square, or arbitrary shapes. Fold into the included carry bag for off-season storage. Color: Blue.