The Purist MoFlo Bottle features an amorphous silicon dioxide coating infused into the inner-wall of the bottle. This creates a glass-like finish that provides a natural and completely inert solution to prevent drinks from staining the bottle or leaving behind residual aftertaste. The infusion shields your fresh water from tasting like plastic on very hot days, making it feel like drinking straight from a sparkling clean glass. The large screw top design is leak-free and wide enough to accommodate ice cubes and powdered drink mix. The updated MoFlo cap retains the same mechanism and delivers great flow while being easier to clean with a flush top and improved grip.