Not sure how cool it is in summer, I used it about 8 times in Colorado’s late winter. It is light, which is what I thought I was looking for. It protrudes high above my head which made me hesitate on keeping, but I thought it might help provide protection in a crash. Now I feel that cables that hold it together and the tall profile make excessive noise while descending. The pads, which are slightly oversized, have started coming off, just after the return window closed. More are on the way, but may need trimming to prevent them coming off. I’ll be looking for a more aero profile like I’ve seen on riders from England.