The Chill-Its 6684 Dry Evaporative Cooling Vest offers immediate and drip-free cooling relief for up to 3 days of cooling. With its exclusive dry evaporative technology, this cooling vest keeps the wearer completely dry and comfortable as opposed to other cooling vests that require soaking to cool effectively. Vest is constructed with industrial-grade quality nylon to enhance visibility and perform in the toughest conditions. Fill the vest through the rear water port. Simply fill with no more than 17oz/500mL of water and do not refill until the existing water has fully evaporated. After filling, turn the vest upside down to allow water to travel through the front and back panels by massaging the shoulder strap channels as needed to help distribute it. Vest requires no refrigeration or gels. High humidity levels and low levels of airflow can impact the cooling evaporative process and may reduce cooling abilities. Learn more about dry evaporative cooling and other technologies here. Pull vest over head and adjust hook-and-loops straps for desired fit. Not to be worn underneath thick or heavy layers of clothing, this body cooling vest needs airflow to properly activate and for the evaporation process to take place. Vest is treated with an antimicrobial that inhibits mold growth. Always keep the cap closed to maintain the vest's effectiveness and do not clean the inside reservoir. This lightweight cooling vest is machine-washable and can be reused repeatedly. It is ideal for workers in construction, carpentry, mining and landscaping. Vest is also a great cooling solution for individuals biking, doing yard work, riding motorcycles and more.