How is a tervis tumbler made?

A Tervis tumbler is made through a process that involves creating two layers of durable plastic, typically copolyester, which are then vacuum-sealed together. This design not only provides insulation to keep drinks hot or cold but also helps prevent condensation. The outer layer often features custom designs or graphics, which are printed using a UV-resistant process. Finally, the tumblers are trimmed, polished, and inspected for quality before being packaged for sale.