This Heat Pack Is Ideal for when shipping temperatures are below 50° Fahrenheit. This will keep things warm enough for 3 days in transit. This is an Add-On Item Only. Please check the temperatures and be mindfulwhen ordering. I am not responsible for Cold damages. If you spend $40 Or more, you get a FREE Heat Pack! (Upon Request only) one heat pack may or may not be enough to keep your goodies warm. I recommend using this in combination with our Packaging Insulation!