Had a challenge trying to find a telescope cover that could handle the summer heat in the Phoenix, Arizona area. Needless to say, the Sonoran Desert cooks in the summer with daytime temps running around 110 degrees for many weeks. Previous attempts using "made for telescope" covers failed miserably. With the summer now started, we'll see if this GYR "fountain" cover can handle the summer. The scope and mount can, but so far, no cover tried has worked and I've had to tear down the setup for temp extremes which requires tedious re-setup for viewing and astro-photography tracking accuracy.