Both tested and authorized by construction teams, severe professional athletes, outside enthusiasts, military men/women, soccer mamas, and more, The IBEX Tumbler includes 2 layers of additional thick cooking area grade 18/8 Stainless Steel, and vacuum sealed to guarantee optimum temperature level retention. We know you” ll love your IBEX Tumbler since we do too! We take fantastic pride in our item and every purchase includes a 100% satisfaction guarantee. There” s absolutely nothing more disappointing than a luke-warm beverage that should be hot or cold! This is one of our main reasons for producing the ultimate beverage 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 rivals! 2X