This is a game-changer! Now you can beat the heat and keep cool while working outdoors in hot environments. Our Hi-Vis Vest comes with the PCS (Personal Cooling System) unit fully installed. Our multi-directional adjustable mist nozzle cools down temperatures by as much as 30°F degrees, greatly extending outdoor activities and making temperature control as easy as pressing a button! Adding more water is easy. Just reach back and unscrew the fill cap and pour a bottle of water into the 1-liter reservoir. Dehydration is extremely prevalent when working in a hot environment. With the Hi-Vis Hydration Pack, you can walk into a refreshing cool mist at all times. ExtremeMist PCS pump can be used anywhere, in and out of the vest, as an easy way to beat the heat on the move. Features: Material: Ultra-Cool 100% Polyester mesh Color: Yellow with reflective strips Compartments/pockets: 6 Reservoir: 1L PCS Features: Water Usage: Level: Approx. Water Usage Lowest Speeds: 1.5 to 2.5 cups/hour Medium Speeds: 2.5 to 5 cups/hour Highest Speeds: 5 to 6.5 cups/hour Weight: 2 lbs 8 oz. Measurements: 27" L ExtremeMIST Hi-Vis Misting Vest