Airia Sub Zero -15 HPI (5LB Brick) Airia "Sub-Zero" cooler packs have been designed at the molecular level so that it freezes at an impressive temperature of -15C (5F). What's even more impressive is that its active ingredient maintains a consistent freezer temperature as it stubbornly thaws when it hits the threshold of 5F. AiriA Sub-Zero HPI is a portable, safe, and re-usable alternative suited to ideally replace dry ice. AiriA -15C works best when frozen for 36 hours at the lowest setting available on all custom freezers. For extended storage periods, the cooler should be packed full of frozen goods and only opened when absolutely needed. These cooler packs are unique to Airia in that they are specifically designed to mount/lock inside the lid and place at base of the AiriA Coolers creating a freezing system that will help you enjoy your time outdoors even more. Manufacturer: Airia MFG Number: A0017 UPC: 856170006195