Come and Check Our Promo Solutions.The outer layer is made of durable non-woven material and the inner layer is made of aluminum foil, which allows hot and cold foods to be stored for several hours at the desired temperature.Durable stitches make sure the lunch bag doesn't crack.It can pack lunches, snacks, seafood, fruit, sandwiches during picnics, hiking, road trips, camping, and carry lunches to work. Pls check inventory and detailed info with us before placing your orders.