The wagon has no air conditioning, so I attempted to do what I could to reduce the scorching cabin temperatures during my commute home from work 25 miles away. Cabin temperature before application, 115F-135F, due in part to the significant greenhouse and dark surfaces inside and out. Cabin temperature after application, 95F-110F. Entirely weather resistant and noiseless. Removed for winter, re-applied for the Vermont/Maine/Mass roadtrip. For future reference, could use second layer of adhesion (3m spray glue?) beneath the Mylar. It is taped down, nothing more.