High Quality : The insulated lunch bags are using high quality material Durable Material & Leak Proof: The insulated lunch bags with a high density oxford cloth surface and non toxic aluminum foil liner, which is soft and easy to clean. Just wipe with a wet cloth and it's good as new! Also using a reinforced zippers to prevent rips, ensure maximum durability. Insulation: The Cool Bags using high quality and non toxic EPE Foam, they are good at maintains the temperature, and with damp proof, wear preventing and anti-corroding function.