The CamelBak Antidote Insulated Tube allows you to monitor how much water you are drinking as well as how much water is left inside your CamelBak Reservoir. The CamelBak Antidote Insulated Tube with Flow Meter easily clips onto any CamelBak Reservoir with the Quick Link system and allows you to start monitoring instantly. The insulated cover over the tube helps to regulate the temperature of the liquid flowing through the tube allowing you to maintain the appropriate temperature you desire.