An air-activated heat therapy patch for neck & shoulder pain Effectively relieves joint pain, knee pain, elbow pain, muscle stiffness & fatigue Generates an average 40?C natural therapeutic heat that targets the affected areas continuously for 8 hours The special elasticated wrap covers the entire joint area firmly & thoroughly Promotes blood circulation, relaxes tense & sore muscles Improves joint strength & mobility Non-medicinal, fragrance-free & no side effects Suitable for people who are allergic to medicine Thin & discreet patch, ideal to use anywhere