By infusing the silicon dioxide, no compromise is made to the structure, and the bottle remains totally flexible for easier drinking.
As pure as drinking from a glass with all the advantages of a flexible bottle. Specialized 340184 Purist Clear with Moflo Bottle; 26 oz FeaturesNew MoFlo cap design features a wide water channel to deliver up to 50% greater flow than other leading bottles, plus improved functional outside gripSpecificationsCapacity: 26 oz The barrier is an extremely thin 20 nanometers; over 5,000 times thinner than a human hair. 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..