The Yeti 30 oz Rambler Tumbler with Lid will exceed your expectations when it comes to keeping your beverages cool! Customers report that even after staying out overnight, they STILL have ice in the tumbler the next morning or their coffee is still piping hot even after a long commute! We hate when our favorite beverage loses its frosty (or piping hot) goodness before we can fully enjoy it. Thats why 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.