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 behind residual aftertaste. This 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 Omni Self-sealing Heart Valve(TM) delivers a high rate of flow with a leak-proof design, even when the valve is open. The refined no-slip grip design and polished surface make it easy to use.