The double-wall insulation is made by inserting a liner inside an outer shell, creating a layer of air between them.

The insulation reduces condensation and keeps beverages hotter or colder longer than non-insulated cups and glasses.

[1] The original technology was developed by two engineers, Frank Cotter and G. Howlett Davis, in Detroit, Michigan in 1946.

In January 2018, "Trinity Graphic USA Inc., based in Sarasota... filed a [federal] lawsuit... alleging that... Tervis caused more than $25 million in damages by violating a non-disclosure agreement.

"[3] On September 5, 2024, Tervis filed for Chapter 11 bankruptcy, blaming several factors as part of the decision, including a heavy loss in sales after a boost from the COVID-19 pandemic, high rising costs, and unprofitable stores.