Precious Herbal Pillow when heated, it generates moist heat and it produces a slight steaming action that penetrates through your skin more quickly than dry heat. This results in immediate relief of aching joints and muscles. Moist heat is also proven superior to dry heat because it actually increases circulation that enables speedy recovery. This is accomplished by its ability to help usher in fresh blood cells, while assisting in the ushing out of unnecessary body wastes that hinder healing. Moist heat also gets deeper into tissues than ordinary dry heat. It helps accelerate soft tissue repair, increase blood flow, decrease muscle spasms and pain. Ultimately, it speeds up the entire healing process!