Ignik's Multi-use Warmers are designed as long-lasting, efficient heat. If you don't use all your heat, simply reseal your partially used warmer in the AirBarrier™ pouch and reactivate the remaining heat up to 3 days later. We believe that you should use all your heat. Also, the inside contents are 100% biodegradable and the packaging and outer are recyclable

HEAT TEST RESULTS Temperature efficiency over time.