Tervis Indiana University - IU Interlocking W/Out LidTumbler Information This printed wrap around design is sealed between the tumbler walls. Tervis tumblers feature double wall insulated construction that keeps drinks hot or cold longer and reduces condensation to prevent rings on your table. Strong, impact resistant BPA free material means these tumblers can take a tumble without shattering and won't retain tastes or odors. Tumbler also comes with an easy to clean BPA free travel lid. Most tumblers