Delivers soothing moist heat to a variety of areas. The positioning strap with hook and loop fastener closure ensures a secure, proper fit for maximum treatment. The easy-to-use hand control features four heat settings and four time settings. Moist heat is more effective than dry heat because moisture transmits heat more efficiently than air. The Therma Moist Heating Pad has an outer flannel cover that draws the airs humidity and retains it. As the heating pad warms, the moisture is released the flannel cover and onto the treated area.