Glass Drinkware is making a comeback. Why? Its cleaner, greener and healty! Introducing the 20oz. h2go Zen. A single wall borosilicate glass bottle that is esentially shatter-proof. Wrapped in a protective Silicone Sleeve, your favorite beverage and bottle will be protected at all times. Keep your water, juice or ice tea crisp and clean in one of today's favorite retail drinkware items.