Driven by a passion for adventure and the outdoors, it’s ingrained, it’s established. Purist features an amorphous silicon dioxide coating that's infused into the inner-wall of the bottle. Essentially, this forms a glass-like finish that provides a totally natural, and completely inert, solution to the problem of your drinks staining the bottle or leaving behind any residual aftertaste. Mo Flow lid: Easy to open, effortless to use, and leak-proof when closed. Made from easy-to-squeeze LDPE material. Clear viewing strip makes it easy to see the bottle's contents. BPA-Free plastic is made from 100% FDA food- grade materials, and it's printed with non-solvent base (UV Cured), CPSC-approved ink and materials.