Whether you are setting up a new above ground pool this weekend or swapping out a tired liner, this 12 ft. round pool liner pad gives you a clean, protective base right where you need it. The non-woven geotextile layer is built thick enough to stop sharp stones, twigs, and gravel from chewing through the liner above it, so the pool you spent hours filling keeps holding water without surprise leaks. Rolling it out is easy: lay the pad in the pool footprint, trim any overhang with household scissors, and center your pool on top before filling. The breathable weave lets rain and splash-out drain through instead of pooling underneath, while also blocking grass and weeds from pushing up into liner seams between swim sessions. Because the fabric is made from recycled fibers, it cleans up at the end of summer, folds flat for winter storage, and comes back ready for another season. Multiple sizes let you match round, oval, and soft-sided tanks, and the cushioned surface is kind on bare feet for kids and adults stepping in and out all summer. If you have worried about punctures, muddy footprints under the liner, or early liner failure, this underlayment puts a tough, low-maintenance barrier between your pool and the ground below. Material: Polyester.