Protect your 18 x 36 ft rectangular inground pool through the off-season with this 20 x 38 ft winter safety cover. A tight-mesh polypropylene surface drains rain and melted snow while trapping leaves, twigs and debris above the water line. Heavy-duty 304 stainless steel tension springs, solid brass deck anchors and triple-stitched seams keep the cover drum-tight against strong winds and loaded snow.