The Rapid Relief Instant Hot Pack delivers soothing heat right away to help promote therapeutic healing where needed. Features, Temperature: Delivers approximately 49'C/120'F of hot therapy when activated at room temperature, FTP (fold-to-pop) technology, allowing the user to activate the hot pack simply by folding it in half, Tri-lingual packaging (English, Spanish and French) Application, INSTANT HOT THERAPY RELIEF:, Sore and stiff joints, Muscle aches and pain, Muscle tension and cramps