The Dirt Defender Bronze grade cover has the strength and durability of covers costing twice as much. Rugged polyethylene scrim and coating means this cover can withstand winter’s worst. Dirt Defender covers are U.V. protected so they will last for years in direct sunlight. The cover’s black underside retards algae growth and heat sealed seams means a crystal clear pool next spring. The big 4 foot overlap ensures a proper fit for above ground pools unlike covers with 3 foot overlaps. Dirt Defender covers are held secure with a heavy duty cable and winch tightener that is anchored by rip proof metal grommets. Backed by an 8 year warranty (1 year full rated). This Dirt Defender cover comes in a dark navy blue with a black underside.The cover is made to rest on the water in order to reduce stress on the pool wall. should hold it in place to protect the cover against the elements