Blue Wave Closed Cell Pool Wall Foam for Above Ground Pools – 48-in x 60-ft x 1/8-in High-Density Padding, Insulating Liner Barrier – Reduces Heat Loss and Prevents Wear and Tear – White
https://www.amazon.com/dp/B01DM28K7W?tag=dmflip-20&linkCode=ogi&th=1&psc=1