I was worried at first about the leather case (the very form fitting one) from Creative, but it does seem to do a great job. The ONLY time I had overheating issues was before I got my leather case. I hid it under my overcoat at a Deep Purple show, and when i left the venue and checked it, low and behold, it was turned off! I think if you leave it clipped to you, or out in the open where it can breathe (but not the sun beating down on it) it really should be ok, I usetwo of the JB3s with leather cases out here in the desert of Albuquerque...