BBBYO 'Glass is Greener' Premium Borosilicate Water Bottle + Protective Carry Cover 19oz Glass promotes 100 % clean, pure, taste. The healthiest bottle choice and absolutely BPA free. Heat resistant borosilicate glass, perfect for hot beverages and cold drinks. Thick 5mm BBBYO neoprene cooler cover keeps drinks hot or cold longer and provides extra protection. The cap is made of stainless steel (inner/outer) with polypropylene casing and silicone seal. The eco friendly choice, glass is infinitely recyclable and reusable. Keep plastic out of our oceans!