Vevor Pool Liner Pad 21' Round Above Ground Extra-Thick Underlayment Mat NewProtect your above ground pool liner with this extra thick round pool liner pad from Vevor. Made from high strength geotextile fabric, it helps shield the liner from sharp objects, weeds, and ground abrasion while adding cushioning underfoot. Its durable recycled material is designed for long lasting use and supports cleaner, more comfortable pool setup. The pad can be cut for fit and works with both soft sided and hard sided above ground pools.