I found triangular foam cove online but it is designed to go on the inside bottom edge of an Above Ground with metal frame. My Intex Ultra needed protection on the outside tub bottom. I added this gutter foam by GutterStuff. I it comes in 7". This is the 5" version and it works just fine. Any rocks that rolled down the Hill or nails that might fall down along the deck will be prevented from getting under the bottom of the pool now. I used rubber cement and glued it to the foam padding underlayment and then placed the pool down. It fits perfect