The Purist bottle is infused with silicon dioxide, which is then added to the polymer structure of the inner surface of the bottle, forming a protective glass-like barrier that prevents odors, stains, and mold from permanently attaching to the inside surface of the bottle.
It will not delaminate or fall off, even when the bottle is flexed over and over. The barrier is an extremely thin 20 nanometers; over 5,000 times thinner than a human hair.