Polar Tech Ice Brix viscous gel moisture safe refrigerant cold pack. Ice-Brix is a specially formulated leakproof, long lasting, viscous gel refrigerant that is made with non-toxic ingredients included in the FDA (GRAS) provision. Generally regarded as a safe substitute. They are sealed in a heavy-duty plastic pouch and keeps perishable products at a constant and desirable temperature. Ice-Brix was rated ""Best in all aspects"". Ice-Brix is the ultimate in refrigerant cold packs. Their unique features includes long lasting cold, efficient transfer of energy, reusable, economical, custom imprinting. Moisture Safe film pouches reduce condensation during the humid months, products arrive dry. Moisture safe bag style.