Laminated polyethylene sheeting woven with thick， high-density polyethylene stitching ensures superior tensile strength and durability. All covers are treated to provide maximum resistance to damaging ultraviolet rays to inhibit deterioration and increase longevity. In-ground pool covers come with standard holding straps for water tubes， optional reinforced webbed border for additional strength and durability and feature conveniently positioned， corrosive-resistant grommets for easy securing. The Swimline 10 ft. Double Water Tube is 33% heavier then other water bags. The valves are easy to fill up with a garden hose. This is used with an in-ground pool cover. 1 Buy equal to 1 Pool Cover and 16 Water Tubes.
New Swimline 20 ft. x 40 ft. rectangular winter inground ground pool cover and 16 Swimline water tubes
Pool size: 20 ft. x 40 ft. rectangular， 4 ft. to 5 ft. overlap (cover size is 4 ft. to 5 ft. larger than pool size)
Highly resistant to punctures， tears， chlorine stains and other chemical stains
U.V. inhibitors protect the cover from Sun damage
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