The Yeti 20 Ounce Rambler Tumbler with Lid keeps hot drinks really hot and cold drinks really cold - and for a LONG time too! Yeti makes the best cooler in the industry for keeping ice longer, and this tumbler carries on the same concept by far. You wil not be disappointed! Yeti over-engineered their Rambler Tumblers with kitchen-grade 18/8 stainless steel and double-wall vacuum insulation. Rambler Tumblers keep ice 2X longer than plastic tumblers and are designed for maximum ice retention – and work just as well for hot beverages. Rambler Tumblers are BPA free, including the crystal clear lid, so you can gauge the level of your frosty beverage as it slides down the pipe.