Icemaster cooler box, insulation layer eps (expanded polystyrene) with molding process, outer pp (polypropylene) and the inner pp (polypropylene). Three-in-one (convenient for cold / fresh / hot storage). Stylish exterior design (tan / white / lilac / ocean). Six advantages of craftsmanship: long lasting freshness. Food-grade materials. Cold and warm insulation. Strength and durability. Easy to carry handles. No need for electricity.