A vinyl liner pool has a custom made sheet of vinyl between the water and the pool structure. Vinyl liners typically lock their top edge, called a bead, into a track located on the bottom of the coping, which is at deck level. Underneath the liner is a sand or cement-like floor, specified in dimension to the “cut” of the liner that is to be used. The galvanized steel walls are supported from behind so that they won’t bow out against the weight of the water. All of the wall panels are secured together to make up the perimeter shape of the swimming pool. Because of the flexibility with the steel walls, a vinyl pool offers unlimited design options, sizes and shapes for your backyard.