|Material||Viscous Gel Refrigerant|
- Keep perishables and pharmaceuticals refrigerated during shipping. 2-pc. cartons include tight-fitting lid and molded, expanded polystyrene body, with white corrugated box exterior. Leakproof Freeze Packs and Re-Freez-R-Brix feature hermetically sealed, nontoxic refrigerants which can stay cold for days.