Optimum insulation performance keeps drinks hot for up to 4 hours or cold for 8 hours. Features a 360° drinking opening, allowing you to drink from every side, making it perfect for use while driving. Practical one-handed operation is enabled by the Quick Press closure. The mug is absolutely robust, made from double-walled stainless steel (18/10). The optimum cleaning lid can be dismantled into two parts and is completely dishwasher-safe. An attractive silicone sleeve with a trendy natural wave pattern and anti-slip bottom ensures stability. Please note that this is an insulated mug. To open and close the bottle, press the button on the lid.