nope, they need to breath. A good cover is the best, but make sure it's nice a tight, it's amazing how that soft material can damage paint when rubbed on long enough. Mine last year actually rubbed the color of a few spots on my awning, and it was tight with extra cords. Had to use vinyl paint to repair the rubbing damage!
We sure love those Jayflights!
2017 Jayflight 26BH ..... Jayflight #6 ( and holding)