Box liner is made of aluminum foil or aluminized pet.For your convenience, the size of product can be made according to your custom requirement.In addition,You can choose different structure of material,such as MPET/Bubble,MPET/Bubble/ MPET,MPET/Double Bubble/MPET.Box liner is used in cartons,which keep food fresh,safe,and insulation from outdoor temperature.The materials are waterproof and the bubbles can reduce the shock and make your products a safe environment.