The Bed Buddy? Cramp Relief Pack delivers incredible pain relief. Simply microwave and let the moist heat ThermaTherapy? deeply penetrate your aches and pains. Pack can be applied directly to skin or over clothes. Calming and soothing aromatherapy with eucalyptus, clove and cinnamon will instantly comfort you and help you relax during your cramps.Moist heat works better than normal gel packs by absorbing humidity in the air and releasing the heat directly into your aching and sore muscles.Put it in the microwave for 2 mins and it will stay warm for up to 40 mins.A Perfect gift idea that helps relieve pain.