Biofreeze is a cooling agent. Menthol is the active ingredient. It is for use with a simple backache, arthritis, bruises and strains. It is a cold therapy and better than ice. Never use heat with it. You can read about it at:

http://www.biofreeze.com/

I tried it once on my feet and could not stand it. It drove my nerves there wild. But, I use it on my calves and my lower back and it is great.