Patented. Heat cells for deep penetrating heat. Up to 8 hours pain relief. Discreet x-shape design with 4-adhesive points to adapt to your movement. Targeted, on-the-go pain relief. Enhance flexibility & mobility. 4 joint heatwraps. Air-activated, one-time use. www.thermacare.com. Questions? 1-800-323-3383. For most recent product information, visit www.thermacare.com.