The Dart 16RCL white Optima reclosable lid seals to foam cups and containers to help prevent leaking and is made with white polystyrene foam. When the reclosable tab is closed it provides a leak-resistant seal, leaving no open drink hole. When the tab is open, it secures to a locking post with side latches. The lid is printed with the words "CAUTION HOT" to alert drinkers to the temperature, and the drinking spout is contoured for comfort.

Disposable food service products are used to store, insulate, transport, prepare, and serve food and drink. They may be made of paper, plastics, or metal foil. Food service products for freezing items protect their contents from freezer burn, contamination, and drying. Microwavable food service products are safe for use to heat food in a microwave. Compostable food service products biodegrade about as fast as yard trimmings and food scraps, and disintegrate so that no large plastic fragments remain.

Dart manufactures disposable products for the food service, retail, and food packaging industries. The company, founded in 1937, is headquartered in Mason, MI.