Material: this lunch bag is made of 3 layer material, the outside layer is thick oxford fabric, the middle layer is 3mm thick Insulation EPE foam, the inside layer is aluminum foil Long Time Insulation: not thickened lunch bag could keep food cool or warm for more than 3 hours Perfect Size: the lunch bag size is 7.8 inch length, 7.8 inch height, 5.1 inch wide Easy to Clean: the PEVA lining is waterproof and easy to clean stain Reusable and Durable: the lunch bag could reusable use for years and the zipper is heavy duty metal Dear customer, Thank you for choosing our products. If there is any problem with our products, please contact us through the order information. We will be happy to serve you and solve it for you as soon as possible within 12 hours, thank you!