The Yeti Rambler Colster is the next evolution in beverage insulating tech. Sure, the Yeti Rambler Tumbler is already one of the greatest insulators on the market, but sometimes you just don't feel like pouring your beverage out of the container it already came in. That's where the Yeti Colster comes in. Simply unscrew the ThermoLock Gasket, place a 12 oz can or bottle of your favorite inside the Colster and tighten the gasket back up. The double-wall vacuum insulation keeps your drink inside at the temperature you left them at. Utilizing kitchen-grade 18/8 stainless steel, the Yeti Colster is exceptionally durable, rust free and sweat-proof. Toss out all your koozies. You won't be needing them to help keep your drink cold when you have the Yeti Rambler Colster.