Both evaluated and approved by construction crews, extreme athletes, outdoor enthusiasts, military men/women, soccer mommies, and more, The IBEX Tumbler features 2 layers of extra thick cooking area 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 fantastic pride in our product and every purchase features a 100% fulfillment guarantee. There” s absolutely nothing more frustrating than a luke-warm drink that must be hot or cold! This is one of our primary reasons for creating the ultimate beverage cooler, the IBEX Tumbler. The IBEX V2 Tumbler is crafted with double-wall insulation technology to keep hot beverages cold and hot beverages cold for up to 72 hours longer than any leading rivals! 2X