As Advertised
This cover is NOT intended as a raincoat for your scope. As advertsied, and shown in the picture, this cover is intended to reflect heat when you set up waiting for sundown, and to keep airborn debris like dust, grit and bird waste off of your nice equipment. I have used both the Telegizmo covers and the Desert Storm covers on several of my scopes (4 refractors, a Dobsonian and an SCT). The Telegizmo covers are extremely durable. The Desert Storm covers, in contast, tend to crease, get pinholes and lose aluminization under frequent use and storage, though those for reractors do tend to cover more completely. I prefer the Telegizmo covers.