SandPuppy hot & cold pack is a large sized multi-purpose reusable hot & cold pack for pain relief. A compact gel pack for pain relief hot & cold, comes in very handy for cold therapy as well as heat therapy. It comes with an easy to hold fabric pouch which makes it very easy to use. Usage Instructions: Cold Therapy - Keep the gel pack in the freezer section of the refrigerator for at least 2 to 3 hours and the pack is ready for use. You can store the pack in the freezer for longer as well. Heat Therapy - Microwave: Place the gel pack in the microwave-safe container. Heat the gel pack in the microwave on high power for 30 seconds (based on a 600W microwave). Carefully remove the gel pack from the microwave using oven mitts or a towel, as it may be hot. Knead the gel pack to distribute the heat evenly. Check the temperature of the gel pack with your hand or a thermometer to ensure it is not too hot before using. If the desired temperature has not been achieved, return the gel pack to the microwave and heat in 10-second intervals until the desired temperature is reached, being careful not to overheat.