Product Overview: YETI Rambler Colster The YETI Rambler Colster, part of the Rambler series, represents the next evolution in can-insulating, hand-protecting technology. All the powers of modern science were brought to bear on this drink insulator to keep the contents of your 12-ounce can or bottle chilled, including double-wall vacuum insulation and a ThermoLock gasket that locks in the cold. The heavy-duty stainless steel walls are sweat-proof, so you can high-five with impunity while enjoying a tasty beverage. Features: 18/8 STAINLESS STEEL: Made with kitchen-grade stainless steel, so they’re puncture- and rust-resistant. DOUBLE-WALL VACUUM INSULATION: Keeps cold drinks cold and hot drinks hot until the last sip. DISHWASHER SAFE: Because no one needs more work to do. LOAD-AND-LOCK® GASKET: Twist-off gasket keeps your bottle or can securely in place.