The 300ml Easy Lock Mug is a double walled stainless steel vacuum mug that keeps your drink warm for up to 6 hours or cool for up to 4 hours. The lid is lockable and therefore avoids any risk of leaking or spilling. The lid can be washed in the dishwasher. The unique design of the mug allows you to drink conveniently and safely with one hand. The size of the mug is suitable to place in any car drink holder.