| 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 | Blue/Black | |||
| 12 | Supreme | |||
| 12 | Space Age | |||
| 12 | Crystal Clear | |||
| 12 | Clear Diamond | |||
| 16 | Ultimate | |||
| 16 | Crystal Clear | |||
| 16 | Clear Diamond | |||
| 20 | Standard |