This Thermos® vacuum insulation keeps drinks hot for 7 hours or cold for 18 hours. Made from durable stainless steel interior, this tumbler is cool to the touch with hot liquids and sweat-proof with cold liquids. This tumbler fits in most vehicle cup holders and is single cup serve compatible. This tumbler has a built-in tea hook that easily holds tea bags and most loose leaf infusers. Perfect for travel this tumbler has a Drinklock™ sealing lid.