Blue Wave NS415 12-mil Solar Blanket for Rectangular In-Ground Pools, 16-ft x 24-ft, Blue Uv-resistant - built for the outdoors, this Rectangular 12-mil Solar blanket for in-ground swimming pools can withstand exposure to UV radiation and will tolerate even the most intense sunlight. Innovative heat source - our technology employs insulating thermal bubbles that trap heat from the sun. These innovative cells retain warmth for effective heat retention even through cool summer nights and cloudy days. Extends the season - this thick 12-mil blanket uses passive Solar heating to increase your swimming pools temperature up to 15 degrees Fahrenheit. Reduce evaporation: prevent up to 95% of pool water and chemical evaporation with the use of a Solar blanket. This reduction of evaporation is not Only , it will save you time and money, as well. 5-Year Warranty - your product comes with a 5-year manufacturer Warranty.