The Tervis drinkware company guarantees to replace any product that has visible defects in workmanship or materials; it doesn't replace drinkware that has been abused or has experienced normal wear and tear. Products covered by this guarantee include tumblers, sippy cups, mugs and water bottles.
Examples of defects covered by the Tervis replacement guarantee include failure of the seal between drinkware walls, discoloration of the drinkware and distortion of the drinkware by heat. Other damage or defects covered by the guarantee include cracking at the top or bottom of the drinkware and detachment of the decoration. To have a Tervis tumbler replaced, the customer must fill out a form and ship the defective tumbler to Tervis.