Here's an option for when you're parked at work.
Car Covers, Car Sun Shades - California PopTop I've got one (came with the car) and always put it on in the morning when I get to the office. I live in central Florida so it's hot. The pop top keeps the interior
noticeably cooler than using windshield sun blocks. And it protects the soft top. The only down side is the Tyvek material leaves a few white fibers on the top at the bow. The fibers come off when I clean the top. It takes less than a minute to put on/off.