UPDATE: After selling my ST1300 with a V Stream wind screen and buying a Moto Guzzi Stelvio NTX, I've found that this jacket performs better now. The V Stream blocked most of the wind and the smaller screen on the new ride allows for much improved air flow through the vents. Ninety degrees is now bearable as long as one is moving, so I avoid towns and traffic when riding. I use merino wool short sleeve tees and the breeze through the arm vents evaporates perspiration, so the liner material doesn't bother me, except when stopped in the heat.