Theratherm Digital Moist Neck Heating Pad, 23 X 20" Produces moist heat automatically without boiling water or use of a microwave Moisture is extracted from the hunidity in the air and retained in the outer flannel cover the rapid increase in temperature forces moisture out of the flannel cover onto the patients skin Theratherm disgital moist heating pad has easy to read digital controls that allow patients to set and monitor treatment temperature and time mosit heat therapy is routinely prescribed for temperary pain relief associated with muscle strain and spasms Use the theratherm for treatment of pain caused by muscle spasms or inflammation muscle strains .