People freak out about the whole getting the temp right but it is rather easy. Some people use the heating pads while other never ever use the heating pads once. Your body gives off an incredible amount of heat you just don't realize it because that's our normal temperature and we are used to it. Even in the winter it is possible to do the trick without pads or the whizzinator or urinator. Practice, practice, practice. The goal is not to slow down heat loss after getting the urine up to temperature but to keep it at body temperature for indefinite periods of time while staying comfortable. If you can't do it naturally, then add heat pads, batteries, and pray.