Both checked and authorized by construction crews, severe professional athletes, outdoor lovers, military men/women, soccer mommies, and more, The IBEX Tumbler includes 2 layers of extra thick kitchen grade 18/8 Stainless Steel, and vacuum sealed to guarantee maximum temperature level retention. We understand you” ll love your IBEX Tumbler since we do too! We take terrific pride in our item and every purchase comes with a 100% complete satisfaction assurance. There” s nothing more frustrating than a luke-warm beverage that ought to be hot or cold! This is among our main reasons for creating the supreme beverage cooler, the IBEX Tumbler. The IBEX V2 Tumbler is engineered with double-wall insulation technology to keep hot beverages cold and hot drinks cold for as much as 72 hours longer than any leading competitors! 2X