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Cheers. The YETI Rambler Colster is equipped with a Double-Wall Vacuum Insulation, to ensure your morning coffee stays hot and that evening beer stays cold to the last gulp. Staying true to the YETI brand, the YETI Rambler Colster is exceptionally constructed. Crafted out of kitchen-grade 18/8 stainless steel, the YETI Rambler Colster is puncture and rust resistant for those accidental slip of the hand drops. The YETI Rambler Colster also packs in a Load and Lock gasket, so your drink will stay firmly in place. What’s more is, the YETI Rambler Colster is dishwasher safe, for your convenience.