Telegizmos makes two different types of telescope covers.  The Standard cover is a multi-layer, polyethylene material with a fully aluminized surface. The heat reflective ability of the cover is extremely high with a material strength equal to a multi-layer light weight tarp.  The Standard TeleGizmos Solar Scope Covers, when used outside, are intended for temporary exposure periods.

For long term continuous 365 outside exposure protection, see the Series 365 Covers!  With over a year of strenuous testing in some of the harshest outside environments, including the desert southwest, Florida Keys, Colorado @ 8000 feet and the Texas Hill country has proven the 365 Series to be capable of handling all types of weather on a continuous 24/7, 365 basis.