Flamingo Ortho Heat Belt Xlarge has 4 layers of insulation on either side for complete comfort and safety. In-built twin thermostat for safety. Ultra soft washable cotton cover, sub type: portable. Velcro strap-on belt, number of temperature settings: 3 used for backaches, sprains, muscular & joint pains, abscesses. Flexible-can be used on any afflicted area.