Iron Flask sells stainless steel water bottles and accessories. Their products are designed to keep beverages hot for up to 12 hours or cold for up to 24 hours. With a variety of sizes and colors, Iron Flask offers options for everyone! Iron Flask bottles feature double-wall insulation and a powder-coated exterior. Iron Flask also sells accessories like straw lids and handles to compliment their water bottles. Iron Flask bottles feature: 18/8 stainless steel, 24/12 Hot + Cold, are powder coated and offer a lifetime warranty.