The Purist Insulated technology shields the inside of the bottle from any bad taste, mold, or staining. Nothing sticks to your bottle so it stays clean and your drink will always taste pure. This 23 oz bottle features a proprietary insulation liner - Chromatek™, this barrier lines the core to keep your liquids cold. The cap features that MoFlo top that is easy to open, effortless to use, and leak-proof when closed.