Muff/hand Size 8 X 17 * Designed For Arthritis Sufferers * New Four-stage Therapy Switch Provides Optimum 20-minute Treatments * Simple One-touch Control Features Auto Shut-off Timer * Produces Intense Moist Heat Without Adding Water * Fast-acting Therapy Relieves Pain And Stiffness For Hours * When Unrolled The Pad Measures 15 X 17