So I asked MIL and FIL what they wanted for Christmas. FIL emailed me back and said for MIL....that she had one of those stadium seat cushions with a gel insert that came out. You could put the insert in the microwave to heat it up. It broke so she can't use it anymore but really liked it ( she has hip problems). Anybody seen one of these?? I searched on amazon but it looks like the only heated ones are plug in... Gotta love shopping for the ILs!