It’s activated when exposed to air, after you open the package. No microwaving or shaking required.

Our heat packs are shelf stable for 3 years from the manufacture date. Although they may still work after that, we can't guarantee it. 

No, they are one-time use and cannot be reactivated once used. 

Yes, they can keep food warm during shipping. Depending on the box size, you may need to use multiple packs. 

One pack will keep the inside temperature at 70°F in 1cu ft box. Use one pack per cubic foot and additional packs to raise the heat 10°F per cubic foot.

We ship everyday, Monday through Friday by USPS. Expect to receive your order within 3-5 days from order date.

We guarantee all packs will activate upon opening. Although rare, any defective packs that don't heat up within an hour can be returned for a full refund.