Deep Heat Back Patches provide up to 16 hours of sustained and soothing pain  relief of back pain, muscular aches and pain, joint stiffness, strains and sprains.  Comfortable to wear, this heat pad applies directly to the skin and can be worn  unnoticed under clothing to provide all day relief. Features up to 16 hours of pain  relief**, Odour Free, Activates in 1 minute*, Extra large for coverage, thin and  comfortable and easy to apply self-adhesive patch.

*The patch activates within 1 minute and will heat up within 5 minutes providing penetrating warmth for up to  8 hours.

**Once removed it can continue to provide pain relief for up to a further 8 hours

http://www.deepheat.com.au