Both evaluated and approved by construction teams, extreme athletes, outside lovers, military men/women, soccer mothers, and more, The IBEX Tumbler includes 2 layers of extra thick cooking area grade 18/8 Stainless Steel, and vacuum sealed to ensure maximum temperature level retention. We understand you” ll love your IBEX Tumbler because we do too! We take fantastic pride in our product and every purchase comes with a 100% fulfillment warranty. There” s nothing more disappointing than a luke-warm drink that need to be hot or cold! This is among our primary factors for producing the supreme beverage cooler, the IBEX Tumbler. The IBEX V2 Tumbler is engineered with double-wall insulation innovation to keep hot drinks hot and cold drinks cold for approximately 72 hours longer than any leading competitors! 2X