Just release the tarp tabs and remove the green nylon cover from the sturdy square sandbox. The beach ball which lifts the cover above the sand and creates a dome effect, by consequence also allows the air trapped inside to warm up the surface of the sand. In an instant children are in kid heaven. Keeps animals, water and yard debris out. The elastic drawstring keeps the cover tight. Tarp tabs make it easy to install and remove. 4' x 4'.