Size: Large 14" x 27". Designed for neck, jaw or sinus areas, but works on any small joint. Hand-held switch to control the heat level exactly the way you prefer, shuts off if you fall asleep or lay the unit aside. Original Moist-Sure cover that automatically produces moisture from the atmosphere. Unique, patented design produces the maximum heat level allowed. Heavy-duty fabric construction w/added weight for dependable auto-contouring & firm contact w/the body. Deep-Heat means professional-level heat therapy. Doctor recommended for the pain of arthritis, back or neck pain, fibromyalgia, sciatica. Works well for any type of pain that responds well to heat therapy.