Rambler 30 is anything but an ordinary tumbler. The kitchen-grade 18/8 stainless steel is built to last, resisting punctures and rust, and double-wall vacuum insulation keeps your beverage as cold (or hot) as science allows, maintaining ice twice as long as plastic. No Sweat? design eliminates the need for a coaster, and the shatterproof lid completes an over-engineered option for the course.