This heavy-duty winter pool cover is designed for in-ground swimming pools. It measures 21 x 41 feet, including a 5-foot overlap for easier installation, and is suitable for 16 x 36 foot rectangular pools. The cover is constructed from extra heavy-duty polyethylene with a 10 x 10 scrim, weighing 2.91 oz./Yd2. It features loops for water tubes, which are sold separately. For pools with steps or a buddy seat, consider ordering a larger size to ensure a loose fit on the water.