I often ride to work and leave my GSA parked outside my office in the open for 8-9hrs. If its been a hot sunny day, I usually find that the seat is very hot at the end of the day; no surprise there because its black. But what does surprise me is that the heat doesnt dissipate as I ride home; the seat remains hot despite my bum shading it for nearly an hour. What I've found on my bike is that the Bosch Motronic unit under the seat gets very hot after a journey but doesnt seem to cool down if the bike is left parked in sunlight, even for many hours. I have gone to my bike after a day at work, lifted the seat and found the Bosch unit still hot which explains why the seat stays hot as I ride home. I now cover my seat if I leave it parked outside my office and the forecast is for hot sunny weather and that seems to allow the Bosch unit to cool down