Our entry level 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. Arctic Armor/Swimline 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 and helps the cover from stretching and ripping like covers with 3 foot overlaps.