Mil A unit of length equal to one thousandth of an inch (0.0254 millimeter), used to specify the thickness of a solar cover. The larger the Mil, thicker and higher quality the solar cover.	Style	Longevity How the manufacturer's warranty holds up with the life of the solar cover.	Heat Retention The covers' ability to cut water evaporation and the effectiveness of reducing heat loss at night.	Heat Production How effective the cover is at allowing the sun's rays to penetrate into the water and to what depth during the day.
8	Standard
12	Supreme
12	Space Age
12	Crystal Clear
12	Clear Diamond
16	Ultimate
16	Crystal Clear
16	Clear Diamond

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