The Purist Fixy 2.0 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 also shields fresh water from tasting like plastic on very hot days, making it feel like drinking straight from a sparkling clean glass. The updated Fixy cap features a redesigned Heart Valve(TM) that requires no push or pull of the mouthpiece-just aim and squeeze. The self-sealing valve delivers a high rate of flow while maintaining a 100% leak-proof design. An ergonomic mouthpiece design provides better mouthfeel, and the redesigned grip pattern offers a modernized look with improved ease of use.