6 x 12 inch. Thermipaq clay therapy. Clay-based therapy. Deep penetrating relief. Reuse it over & over. Convenient & portable. Back, knees, ankles, elbows. Multi-use wrap with velcro pouch. Recommended by leading healthcare professionals. Reusable. Biodegradable & latex-free! Enjoy the most therapeutic hot & cold relief with Thermipaq! Thermipaq is superior because of our patented, thermal ceramic compound made from all-natural, clay-based materials.