NATURAL PAIN RELIEF : Relief Sciences uses medical grade materials partnered with natural steam releasing clay beads for deeper penetration to effectively relieve pain and tension. VERSATILITY : Relief Sciences heavy weighted moist therapy compress is specifically designed to contour to your body to provide pain relief for your neck , shoulders, back, hip and more. It feels like a therapeutic moist warm hug. 5 lbs weight SUPERIOR QUALITY: Relief Sciences deep penetrating moisture therapy pain relief heating pad measures 12 x 23". It is is over stuffed with natural clay beads to ensure maximum contact points to quickly relieve tension, pain and stress.