Tervis Tumbler manufactures insulated tumblers that use double-wall technology to harness the natural insulating properties of air. The double-wall insulation is made by inserting an inner liner that fits inside an outer shell, creating a layer of air between them. The two liners are then permanently fused together. The insulation reduces condensation and keeps beverages hotter and colder longer than non-insulated cups and glasses. 
The original technology was developed by two engineers -- Frank Cotter and G. Howlett Davis -- in Detroit, Michigan in 1946. Cotter and Davis combined the last three letters of their surnames to come up with the name Tervis.  John C. Winslow purchased the Tervis product rights in the 1940s. The Tervis Tumbler Company was then incorporated in 1967. All Tervis drinkware is still made in the USA at the Venice, Florida manufacturing plant.
Products and Marketing
Tervis drinkware is available in the following sizes and styles:
- 8 ounce non-insulated tumbler
- 10-ounce tumbler
- 10-ounce wavy tumbler
- 12-ounce tumbler
- 16-ounce tumbler
- 24-ounce tumbler
- 15-ounce mug
- 16-ounce goblet
- 24-ounce water bottle
A 2.5 quart ice bucket is also available, along with accessories such as travel lids and straws. 
In addition to its in-house designs, Tervis has licensing agreements with all five of the major American sports leagues (MLB, MLS, NBA, NFL, and NHL), nearly all major NCAA colleges and universities, all branches of the United States Armed Forces, and many companies such as John Deere, Coca-Cola, Disney, Hello Kitty, Marvel, Nickelodeon, Warner Bros. and Lucasfilm. 
The drinkware is available in seven color choices in addition to clear, and customers can also customize their drinkware with original artwork and/or photography that they provide. 
Every Tervis tumbler has a lifetime guarantee against manufacture defects. Replacement of drinkware can be expedited via the form found on their website.
Tervis tumblers are dishwasher safe (top rack only) and can go in the freezer. Tervis tumblers and mugs are microwave safe for up to 30 seconds at a time, unless you see a "Do Not Microwave" or "Microwave Only When Full" sticker located on the bottom of your cup. Some designs have metallic elements in them as part of the decorating technique; these come with a "Do Not Microwave" sticker indicating that they are not microwave-safe. Others are made with materials that can be microwaved as long as they are full of liquid up to 1 inch from the top of the cup; these come with a "Microwave Only When Full" sticker indicating this.  Tervis drinkware is also BPA free. 
Tervis Tumbler currently has 32 retail locations in 15 states:
- Coconut Grove, Florida
- Fort Myers, Florida
- Jacksonville, Florida
- Key West, Florida
- Naples, Florida
- Osprey, Florida
- Palm Beach, Florida
- Panama City Beach, Florida
- St. Armands Key, Florida
- The Villages, Florida
- Las Vegas, Nevada (Miracle Mile)
Tervis in the Community
- In addition to a recycling mandate at its corporate office and production facility, Tervis has a 'Green Team' that works towards improving efforts within the surrounding communities to operate in an environmentally responsible manner.
- Tervis donates 5% of sales of Pink Ribbon designs to breast cancer organizations, and 5% of sales of autism awareness designs to autism awareness organizations.