These packs are not only high quality but also HIGH TECH! They are designed to undergo "phase change" (begin freezing or melting) at 71.6°F (22°C). When you think the temp inside your box might rise ABOVE this, use a frozen Phase 22 pack. It will absorb the heat energy in your box as the pack changes from solid to liquid, thereby keeping the contents of the box cooler.
When you are concerned that the temp inside your box might dip slightly BELOW 71.6°F (22°C), use an un-frozen pack. It will release its heat energy inside your box as the pack tries to "phase change" from liquid to solid, thereby keeping the contents of the box slightly warmer.
***HELP US RECYCLE AND REUSE:***
Return the phase 22 pack for a $20 coupon to our store! Customer pays for return shipping. Refund is given once the pack is received. Coupon valid for any listings. No exclusions apply.
Cold or Heat Pack duration will vary per shipment and heat packs can fizzle out prior to delivery. We don't make these.
We are not responsible for perishable items and plants once they leave our facility.
Please add a Cold or Heat Pack to your cart.
