Mammoth Rover Tumbler

Thanks to the double-walled vacuum insulation, this tumbler is designed to hold temperatures for extended periods. While exact times vary based on the starting temperature and ambient conditions, it is engineered to keep drinks hot or cold throughout your typical workday or commute.

The lid features a rubber gasket and a stopper designed for a secure, snug fit that minimizes heat loss and prevents splashes. However, it is not fully leak-proof, so we recommend keeping the tumbler upright rather than tossing it loosely into a bag.

No. The Rover is crafted from 18/8 kitchen-grade stainless steel, which is non-reactive and resistant to flavor transfer. Your water won't taste like your morning coffee, even after a quick rinse.

Not at all. The tumbler features a sweat-proof design that prevents condensation from building up on the outside, ensuring your grip stays firm and your desk or car cup holder stays dry.

While the 18/8 stainless steel is durable, we recommend hand-washing the tumbler to preserve the finish and the integrity of the vacuum seal over time. The lid can typically be placed on the top rack of a dishwasher.