I've been looking for a sunscreen for my overhead. The summer heat in AZ is brutal, but I was not satisfied with a standard car shade--too dark, poorly fitting, can't see through, etc. I found a new vendor who makes custom shields--flexible, semi-transparent, very heat reflective. Pretty cool. Attaches with suction cups. The one they made for me is now their pattern for other Kitfoxes--but just for the larger Series 5 and up. I'm sure they'd make for smaller.
http://aero-shields.com/
Tucsonchris