Both evaluated and authorized by building and construction crews, severe athletes, outside lovers, military men/women, soccer moms, and more, The IBEX Tumbler includes 2 layers of extra thick cooking area grade 18/8 Stainless Steel, and vacuum sealed to guarantee maximum temperature retention. We know you” ll love your IBEX Tumbler because we do too! We take great pride in our product and every purchase comes with a 100% fulfillment warranty. There” s absolutely nothing more frustrating than a luke-warm beverage that must be hot or cold! This is among our main reasons for creating the ultimate drink cooler, the IBEX Tumbler. The IBEX V2 Tumbler is engineered with double-wall insulation technology to keep hot drinks hot and cold drinks cold for as much as 72 hours longer than any leading rivals! 2X