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Guarantee Information

All HOWW Thermal Tumbers (sonic seal) are guaranteed to last a lifetime under normal use.

Though HOWW Thermal Tumblers are top-rack dishwasher safe, we recommend hand washing all HOWW products due to the possible effects that powerful dishwashers and harsh detergents can have on the plastic and decoration.

Should your tumbler become defective at the sonic seal (where the two glasses are joined) then simply send it back prepaid and we will provide a replacement. We will attempt to provide you with a replacement with the same insert or imprint as on the original piece as long as it is still available. If the design is not available, or cannot be reused from the returned cup, the customer will receive a clear tumbler in exchange.

Send defective tumbler to: Howw Mfg. Attn: Returns, 28W020 Commercial Ave, Barrington, IL. 60010 Be sure to include your return shipping information and any special instructions.


This guarantee covers HOWW Thermal Drinkware only and does not apply to any other HOWW products.

This Guarantee does not cover:

  • Mis-use, including but not limited to; dropping causing cracking, commercial dishwashers, intentional breakage of the seal.
  • Dish washing soaps or hard water conditions that cause discoloration to the tumbler.
  • Returning after use for events when no defect is present or intentional damage has been done.
  • Slider lids, straws and tether caps are not covered under this guarantee.