Paper cups to go are a thing of the past. Get the new thermal mug from Sigg so that you always have your favourite hot coffee or tea with you. The stainless steel mug is double-walled and vacuum-insulated, so it keeps drinks hot or cold for hours. It is leak-proof thanks to a safety button: press to drink and release to close. Whether as a coffee mug on the way to work or as an insulated mug for tea and other hot drinks - the Miracle Mug is durable and free from harmful substances.