... client pantone FeatureReusable, easy to carry, new designCertificateEN71,MSDS,FDA,ISO9001UsageHeat therapy for relief of pain and ... sample confirmed. 2.What is the pack ?The instant heat pack contains water, a stainless steel disc ... 4. How long does the heat last ?The instant heat pack stays hot for about 30 minutes to ... away from the pack. If using it for hand warmer use, put it inside your pocket for ...