I just discovered another use for a neck warmer. I lined a plastic tub with bubble wrap, heated the neck warmer 2 minutes in the microwave and placed it in the tub with the lid closed. Temperature went to 80 degrees within 2 minutes and stayed there for over an hour! It declined slowly and was still warm after 2 hours. In addition to heat, the warmer gave off moisture causing an almost steam bath in the tub! I used a "hot pockets" neck warmer. Carolynn