Our Full Size inflatable air pillows are the same size as your pool designed to create a dome over your pool once the cover is installed. Our Gorilla Pillows are designed to protect from freezing ice. Our 12 foot round large winter pillow was designed to push debris and water closer to the edge of your pool to remove easier. Our Gorilla Pilla's are the only winter pillows made of two layers of material. An inner PVC material to inflate and an outer Poly material to protect it. These are the strongest winter pillows made.