The Thermos Rock 1L stainless steel flask is ideal for staying recharged when travelling or in the workplace. Thermos Vacuum Insulation technology ensures maximum temperature retention - meaning your liquids stay at the optimum hot or cold temperature for up to 24 hours. The Thermos Rock Flask features a durable stainless steel interior and exterior with a convenient non-slip carry handle - perfect for any work site! Thermos has designed this flask to be cool to the touch when used with hot liquids, and free from condensation when used with cold liquids. To use, simply twist the stopper and pour in to the included, insulated stainless steel cup.