Isotec. Layered insulation 2.0. Isotec 2.0 insulation provides enhanced thermal retention to keep contents colder and fresher. Ideal for half-day activities in moderate temperature conditions. Durable outer material. Material backing. Single layer polyethylene foam. Closed cell polyethylene foam. Retained thermal energy. PVC free PEVA lining. Cold Matters. It matters. Thermos insulated products are created with the highest quality insulation technology on the market. Keeping your foods cooler for longer helps inhibit the growth of harmful bacteria. By using thermos brand insulated products, families can be confident that they are providing the highest quality food and beverage storage for their loved ones. Product features: Isotec superior insulation keeps food fresh; heat-sealed PEVA lining; durable, easy-care fabric.