Hi Jen, I use the Heat Max, Hot hands and find them real good. They stay warm for up to ten hours. Also, look on Amazon.com for heating pads.
They have real good prices and I by everything
through them. What are you using it for?
Cathy
PS if it is for your neck you can get a neck pillow and it will keep it warm at night. That is
what I do. :rolleyes: