This worked well under our pool. We didn't have the ground leveled or prepared ahead of time, and this pad kept the pool safe from punctures and also kept the ground soft to walk around on, so the kids didn't notice bumps and rocks. It's very thick, but has a seam down one side. I worried the kids would feel it, but they didn't seem to notice. Will continue using it as long as we have the pool!
Rating: [5 of 5 Stars!]