This double-walled tumbler offers all the benefits of stainless steel and can be enjoyed with legendary and beloved exclusive Tervis designs. Up to 24 hours cold and 8 hours hot. Double-wall vacuum insulation and copper lined 18/8 stainless steel with leak resistant & easy-close lid. Do not put tumbler in dishwasher, freezer or microwave. Hand wash with soap (no bleach or chlorine) & water using a scratch-free sponge. Limited 5-year guarantee. Lid is dishwasher safe (top rack only).