I have to give an update to this thread because I originally said my lowers come off once the weather gets warm & stays warm; this spring, I tried some inexpensive vents that seem to work great. The vents can be open or closed, no in between, but so far that has been fine. I have been riding with the lowers ever since cutting the vents in and have not experienced too much heat yet. We are getting ready to have a string of days in the upper 90's, so I'll really get to check them out in the heat in the next few days. The vents come in Chrome or Black, I got the Black because I thought it would not stick out as much.