UniHeat 72 Hour (Air Activated Heat Packs)
We recommend this product to protect your plants in transit against freezing. It will maintain lifesaving warmth for up to 3 days. You should consider this product if temperatures are below 40F in your area. One pack is recommended for a 1 cubic foot size box. Larger orders may require 2 to 3 packs. There is no handling or shipping charge on this item.
Operation is very simple. The heat pack turns on when we open the package and expose it to air and insert it into your package. Sealed in the heat pack is a high grade iron powder which undergoes rapid rusting, thereby producing heat as a by-product. All ingredients are not only natural but are safe, nontoxic, nonflammable and 100% biodegradable. Just dispose of the used heat pack in the garbage.