Description : 310742098433 This comfortable heating patch is safe to be applied directly to the skin and can be worn unnoticed under clothing as you go about your daily routine. Lasts up to 8 hours. WellPatch Warming Pain Relief Heat Patch- Multi-Purpose with Air Activated Technology. WellPatch - Fast Acting and Long Lasting Pain Relief at a Great Value!. Whether it?s a sore back, stiff muscles from over-exertion, aching joints from arthritis or a migraine headache, WellPatch has a patch for you!.