Tervis insulated drinkware delivers the ultimate combination of performance and personality for pure drinking enjoyment. This double-walled tumbler offers all the benefits of stainless steel and can be enjoyed with legendary and beloved exclusive Tervis designs. Greatly reduces condensation. Double Wall Vacuum Insulation. 24 Hours Ice Cold. 8 Hours Piping Hot. Splash-Proof, Shatter-Proof & Easy-Close Lid. Limited Lifetime Guarantee.