Nylon gel pack designed to fit the shape of the neck & shoulder for direct application on the skin. Can go to the freezer (cold) or microwave (heat). Heat: Pain relief of arthritis, osteoarthritis, bursitis, tendinitis, stomach-aches, neck or muscular pain or for relaxation, increases blood circulation and helps fix the damaged tissues, relaxes tissues, reduces pain. Cold: Pain relief of bursitis, sprain, inflammation, migraine, fever, tendinitis or bruises. Cold applied every 2 or 3 hours reduces the risk of internal bleeding, reduces the pain (relief can last 2 to 3 hours), calms inflammation, eliminates muscular spasms and involuntary muscle contractions. Read carefully instructions on the gel pack before utilisation. If pain persists, consult a specialist.