Both evaluated and authorized by building teams, severe athletes, outside enthusiasts, military men/women, soccer moms, and more, The IBEX Tumbler includes 2 layers of additional thick kitchen grade 18/8 Stainless Steel, and vacuum sealed to guarantee maximum 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 warranty. There” s absolutely nothing more frustrating than a luke-warm beverage that must be hot or cold! This is among our primary reasons for producing the supreme beverage cooler, the IBEX Tumbler. The IBEX V2 Tumbler is engineered with double-wall insulation technology to keep hot drinks hot and cold beverages cold for approximately 72 hours longer than any leading competitors! 2X