The YETI 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.