We had a cool cloudy day and I didn't feel like giving up on boating for the afternoon that I had off from work early. So we put the camper top on! Even put the windows and side panels on. Didn't try the back window though. It is like the rear side windows, canvas with a mesh netting rear window and roll-up canvas window-cover. Suprisingly it worked awesome with the tower and was easy to wakeboard with it up! Very warm inside and very isolated from the wind. So warm in fact that we stayed out til 10pm. These pics were at night with a flash and you can still see the red LEDs in the 3rd pic hehe.