This exterior of thermal lunch bag is made of 80gsm nonwoven polypropylene, foam and the interior is insulated aluminum foil. Keeps your food warm or cold for hours well. Sturdy and durable, tear resistant, wear-resistant, waterproof and dirt-proof, easy to clean. Full closure and double handles design, easy to open and close, designed to be a versatile tote. 8 1/4'' L x 4 1/3'' W x 10 1/4'' H