Designed for the neck, sinus or TMJ area, our Petite Thermophoreﾃつｮ pack is also wonderful for applying moist heat therapy to specific joints - such as the elbow, knee or ankle.;The 17 x 4 unit with a long Velcroﾃつｮ fastener allows adjustment for a snug fit on any small area.;Thermophore ClassicTM Deep-HeatTM Pack is designed with a special hand-held switch;Just press for heat, release to cool and alternate as often as you like;If you happen to doze off and your hand relaxes, the unit will cool as a safety feature.