Teassentials 15 Ounce Double Walled Borosilicate Glass Tea Infuser Bottle / Tumbler DOUBLE WALLED DESIGN: Look closely before you buy a different glass bottle. Is it made with a double walled construction or single walled construction? Double walled containers maintain the temperature of your liquids much longer than single walled containers, and are cooler to the touch. PREMIUM BOROSILICATE GLASS: Dont waste your money on cheap plastic that has no insulating property at all. Borosilicate glass is BPA free and known for its high tolerance to heat and excellent resistance to severe temperature changes. It is such a good insulator that it was used in the manufacture of thermal insulation tiles for the space shuttle. You might say its NASA approved. MULTI-PURPOSE: Our bottles unique two piece stainless steel infuser allows you to create a multitude of drinks: hot tea, cold brew tea, cold brew coffee and any fruit infusion you can imagine. SUREGRIP NEOPRENE SLEEVE: Carry your bottle anywhere, safely and comfortably with the included Suregrip neoprene sleeve, providing extra protection and insulation while on the go. DISHWASHER SAFE: Our bottle is dishwasher safe. Just make sure to put the lid on the top rack. And unlike plastic infuser bottles, it wont become cloudy from repeated dishwashing.