Midwest Canvas Extra Heavy Duty Solar CoverThe Midwest Canvas Extra Heavy Duty Solar Cover is an extremely beneficial product for pool owners to reduce costs and effort in regular maintenance schedules. Solar covers help to conserve water from evaporation and reduce cleaning time by protecting the pool from debris and dirt entering the water. 12 Mil Thickness 5 Year Warranty Increases water temperature in pools Cut nighttime heat loss Keep pool clear of dirt and debris Reduce chlorine loss