Hot drink cups offer a PLA inner lining to ensure a leakproof seal without the use of conventional plastic. Lining is made of a plant-based resin. Smooth rolled rim ensures comfortable use and a secure lid fit. The exterior design features a map of the world with the land masses in white. Cups are made from renewable resources including paper, and with an inner lining made with Ingeo biopolymer, a natural plastic made from corn. BPI certification verifies that environmental claims have been validated by an objective organization. Paper hot cups are not recommended for microwaves.