Odor-free, stain-free, clean tasting, 100% Borosilicate Glass with real wood friction-fit lid.Colorful silicone sleeves prove a no-slip grip and make it easy for kids and gueststo identify their own glasses,Protective silicone sleeves make the glass perfect for outdoor use.Glass water bottle can be used to fill many kinds of liquids, such as cold/hot water, milk and beverages etc.All parts are BPA/BPS free.