All HOWW Thermal Tumblers (sonic seal) are guaranteed to last a lifetime under normal use.
Howw Thermal Plastic Glassware are top rack dishwasher safe. But hand wash is recommended just because dishwashers are pretty tough on plastic products.
Should the tumbler becomes defective at the sonic seal (where the two glasses are joined) then simply send it back prepaid and we will provide a replacement.
Send defective glass to:
Lambert Online Marketing
921 Hygeia Avenue
Encinitas, CA 92024
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Last Update 07/06/13