Climate Change?..  Not with these Mugs!!!   Human Tested and Penguin approved.  BRRR Tumblers are made from the highest quality Stainless Steel. Double-wall insulated your tumbler is guaranteed to  perform at the highest level.  Every BRRR TUmbler comes with both a traditional style lid and a slide lid so you don't have to choose! Just pick your favorite, and still have a back up if one is ever lost. Also know that a portion of the proceeds from your purchase of BRRR Tumblers, is donated to charities dedicated to protecting the global penguin population. See our About us section on the website.