With superior insulation guaranteed to keep liquids cold for up to 12 hours and hot for up to six, the Hydro Flask 20oz Coffee with Flex Sip Lid allows you to return to your morning cup of coffee or tea throughout the day without worrying about the contents getting unpleasantly lukewarm. 18/8 pro-grade stainless steel is incredibly durable and doesn't affect the flavor of your water. The Flex Slip Lid is ideal for sipping at hot drinks and is designed to prevent leaking. Easily disassemble for cleaning.