For those who prefer the superior light-blocking properties of a solid safety pool cover, there's new ULTRA-LOC III from LOOP-LOC. Strong, durable, and maintenance-free! Premium coated vinyl material with enhanced 100% polyester rip-stop scrim. Super-strong, durable material. Cover without panels blocks 100% of sunlight and comes with automatic pump, which must be used at all times to meet ASTM safety cover standards. Unlike traditional solid water bag covers, there is no scrubbing or maintenance required. Fits any pool or spa perfectly, from a simple square to a complex installation with a custom cover. LOOP-LOC covers not only meet, but exceed, ASTM standards for Safety Swimming Pool Covers F 1346-91. For Pool Size: 16' x 32' + 4' x 6' center end (=16' x 36') Cover Size: 18' x 38' Sets of Hardware: 28 Square Footage: 684 Shape: Rectangle Material: Solid Coated PVC Color: Blue