Designed to the same volume as a typical mug of tea, the excellent Lifeventure Thermal Mugs are ideal for making & storing steaming hot drinks for up to four hours, or for ensuring your ice cold drinks remain near freezing for up to 12 hours. They are suitable for use anywhere from high on the hill, where temperatures can drop dramatically, right through to roadside picnics – it really is a versatile product. The stainless steel construction is unbreakable when dropped, there is an expansion chamber with pressure release valve, & the watertight design is sleek & available in 11 different colours.