The Rectangular Above Ground Pool Bestway 56629 Power Steel™ Is Designed And Made Of Carefully Selected Materials To Guarantee A Sturdy And Resistant Product And Guarantee Longtime Solidity. The Main Material Used For The Structure Of The Pool Is Three-Layer Pvc, I.E. Covered With 2 Layers Of Vinyl Pvc At The Ends And Inside With A Layer Of Industrially Welded Polypropylene, Process Which Makes The Pool Tougher. In Addition, The Entire Structure Is Supported By A Large, Rustproof, Galvanised Metal Tubular Frame.