The shell is made of Polyurethanes PU leather which is damp-proof, waterproof and dirt-resistant, so it is easy to wipe clean with a rag! Aluminum clad laminated expandable polyethylene layer is here to keep your food or drinks at the optimal temperature for hours. The aluminum will ensure a high level of insulation and durability! The inner lining made of aluminum foils is eco-friendly and food safe, also wipes clean easily, offer you great thermal resistance, keeps the food fresh and warm/cold. The dimensions in 9 x5.9 x7.8 inches. It is spacious enough for a one-person-meal. We take your health and well-being very seriously. That's why we have designed this durable, safe and protective insulated lunch bag, to make your life healthy and easy!