The Rambler 30 oz Tumbler with Magslider Lid will keep your beverage frosty or piping hot for along as it takes you to finish it. It is made of durable kitchen grade 18/8 Stainless steel. It has double walled vacuum sealed construction to give you the best available insulation. The Rambler tumbler keeps ice 2X longer than plastic tumblers and are designed for maximum ice retention, but it works just as well for hot beverages. It is BPA free and has a crystal clear Magslider lid for an easy open.