Mini Size - Air Activated Heating Replacement Pax ThermaFur Air Activated Heating Replacement Pax. Air Activated Heating: This simple, yet effective technology works by combining several natural elements such as carbon, iron powder and vermiculite to generate an exothermic reaction. Air Activated Heating Technology Key Benefits: Can be used to combat the cold or for theraputic purposes; Natural, heat generating ingredients stored in soft, flexible inserts. Mini Warmers for pet coat last up to 8 hours; Heating can be suspended at any time by resealing the inserts in an airtight container or plastic bag. Replacements for pet coat-mini size; Replacements for pet pad-regular size. Easy to Use: Open the HEAT PAXTM Warmer wrappers. Insert the Warmers in our garment pockets. Wait 10 minutes for the Warmers to heat up fully. Soothing and comfortable 135 degrees F (57 degrees C) warmth for up to 8 hours. THIS LISTING IS FOR THE SIZE, COLOR AND QUANTITY IN THE LISTING TITLE.