The all-new Purist Insulated features Chromatek(TM) liner-a proprietary insulating barrier that lines the core to keep your liquids cold. New squeezable materials allow for unmatched flexibility alongside the insulation technology. The Purist Insulated Chromatek bottle features an amorphous silicon dioxide coating infused into the inner wall. This forms a glass-like finish that provides a natural and completely inert solution to prevent drinks from staining the bottle or leaving residual aftertaste. The infusion also shields fresh water from tasting like plastic on very hot days, making it akin to 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 Heart Valve delivers a high rate of flow with 100% leak-proof design and an ergonomic mouthpiece for better mouthfeel. The redesigned grip pattern provides a modernized look and ease of use.