Rigid, reusable, one-piece, three-layer laminate construction provides excellent temperature protection, and exceptional strength and durability. Durable closed-cell polyurethane foam insulated shippers ensure frozen or refrigerated products from moderate and extreme ambient temperature exposure. Flexible polyurethane foam plug seals the top, cushions and insulates contents, and vents dry ice. Shippers withstand crush compression in excess of 5000 lbs. CFC and HCFC free; comply with international clean air regulations.