YETI Rambler 20 oz. Tumbler w MagSlider Lid Is your coffee cold by the time you get to work? Ice water luke-warm after a few casts on the lake? The Yeti Rambler Tumbler is the solution to your beverage frustrations. These tumblers have been over-engineered to ensure your beverages will stay ice cold or piping hot longer. Feature double-wall vacuum insulation and a 188 stainless steel body. The Yeti Rambler can take a beating, and is built with the strength you come to expect from Yeti products.