The Yeti Rambler™ 20 oz. Tumbler will keep your beverages ice cold or piping hot longer. The Tumblers have a 18/8 stainless steel body and double-wall vacuum insulation. They’re BPA-free, have a No Sweat™ Design so your hands stay dry, and are dishwasher-safe. Screen-printed reverse Peterbilt logo. Stainless Steel.