●Heavy-Duty Pvc And Polyester 3-Ply Side Walls ●Built-In Flow Control Drain Valve Makes It Easy To Drain By Attaching The Valve To A Garden Hose (With Included Adapter) To Drain Away Water ●The Durable, Puncture-Resistant Liner And Corrosion-Resistant Steel Frame Make This Pool Series Strong And Sturdy For Backyard Use All Season Long.