An air-activated heat therapy patch for neck & shoulder pain Effectively relieves neck & shoulder pain, muscle stiffness & fatigue Generates an average 40?C natural therapeutic heat that targets the affected areas continuously for 10 hours Comes with a unique U-shaped design that firmly adheres to clothing around both the back & sides of the neck & shoulders Promotes blood circulation, increases mobility, relaxes stiff & tense muscles Non-medicinal, fragrance-free & no side effects Suitable for people who are allergic to medicine Thin & discreet patch, ideal to use anywhere