I warm them up in the microwave for about 1 1/2 minutes and they stay warm for about an hour - as long as they stay covered.
The boys love them because they get to have bugs in their beds! And I love them because I don't hear about freezing feet anymore!
I titled this 'bed bug bean bags' but they are really filled with soft wheat. The name was a little more catchy than 'bed bug heat packs' so I couldn't resist.
You will need the following items to create bed bugs of your own:
-embroidery book - if you don't know the stitching
-filler - soft wheat, buck wheat, rice, dried beans, split peas, or anything that can hold heat. I used organic soft wheat. It retains heat longer than rice, and I like it better than dried beans because it is much smaller. Split peas also work well.