Both checked and authorized by construction teams, severe athletes, outside enthusiasts, military men/women, soccer mommies, and more, The IBEX Tumbler includes 2 layers of extra thick cooking area grade 18/8 Stainless Steel, and vacuum sealed to guarantee optimum temperature retention. We understand you” ll love your IBEX Tumbler because we do too! We take terrific pride in our item and every purchase comes with a 100% complete satisfaction guarantee. There” s absolutely nothing more disappointing than a luke-warm beverage that must be hot or cold! This is among our main factors for developing the ultimate drink cooler, the IBEX Tumbler. The IBEX V2 Tumbler is engineered with double-wall insulation innovation to keep hot drinks cold and hot drinks cold for as much as 72 hours longer than any leading competitors! 2X