21 FT Round Thickened Pool Liner Pad — Under-Pool Ground Mat for Above-Ground Pools, Puncture Protection & Liner Life Extension

Protect your above-ground pool liner with this 21 FT round thickened under-pad designed to sit beneath the pool floor. The heavy-duty foam layer cushions the liner against sharp objects, rocks and debris to reduce punctures and costly repairs. By absorbing impact and evening out small ground irregularities, it helps extend the usable life of your pool liner. Comfortable, smooth underfoot, and suitable for family use, the cushioned surface transforms the pool bottom into a softer, more enjoyable area for swimming. Installation is simple: place the mat under your round above-ground pool to shield the liner from dirt, uneven terrain and everyday wear. Constructed from robust, high-density foam for long-lasting performance, this pool ground pad delivers reliable support season after season. We stand behind product quality and provide responsive customer service. Note: this product prioritizes durability and quality but is offered without a warranty.