Little superhero fans will love this spider man paddling pool it is made from 3 separate layers of material the inner layer of polyester mesh is laminated to the outer layers of heavy gauge pvc to ensure a solid sturdy construction for the pool the liner is supported by an inflatable top ring which allows the pool to rise as it is filled with water when ring is inflated the pool is easy to drain with a flow control valve which attaches to a garden hose for drainage away from the pool area