The Chill-Its 6687 Dry Evaporative Cooling Vest offers immediate and dry cooling relief that lasts up to three days. With its exclusive patented dry evaporative technology, this cooling vest keeps the wearer completely dry and comfortable, as opposed to other cooling vests on the market that require soaking and get you wet. The lightweight vest is constructed with high-visibility industrial-grade quality nylon to perform in the toughest conditions. Design features an elastic hook & loop belt that allows for a snug, customizable fit. This lightweight cooling vest is machine washable and can be reused over and over again. Features: Instant cooling relief with patented technology Long-lasting effect: Up to 3 days of cooling power to help maintain a healthy body temperature Easy activation: Fill vest with 13.5oz - 15.5oz / 400ml - 450ml of water Lightweight and durable made of industrial grade quality nylon Elastic wrap closure for personalized fit Machine washable Cooling material is treated with an anti-microbial that inhibits mold growth. Keep cap closed at all times to maintain vest's effectiveness. Do not clean the inside reservoir Application: Construction Trades Maintenance Landscaping/Grounds Assembly/Fabrication Material Handling Freight/Baggage Warehousing/Distribution Iron/Steel Fabrication Performance & Tech Tags: Chemical-Free Machine Washable SIZING Available in two different sizes: S/M (32in - 40in / 81cm - 102cm) and L/XL (40in - 52in / 102cm - 132cm). To measure your size, wrap a tape measure around the widest part of your chest, under your arms, and completely around your torso. See the full sizing chart for details. HOW TO ACTIVATE Simply fill the vest with 13.5oz - 15.5oz / 400ml - 450ml of water for immediate and long-lasting cooling relief. No refrigeration or gels necessary! Cooling process can last up to three days depending on humidity and heat levels. High humidity levels can slow down airflow and may reduce cooling abilities. HOW TO WEAR Pull vest over head and adjust straps to fit. Not to be worn underneath thick or heavy layers of clothing, this body cooling vest needs airflow in order to activate and for the evaporation process to take place. Do not clean the inside reservoir. Cooling material is treated with an anti-microbial that inhibits mold growth. Always keep cap closed to maintain vest's effectiveness. This evaporative cooling vest is perfect for anyone in need of instant cooling relief while working or playing outside in warm temperatures where heat-related illnesses like heat cramps, heat strokes, heat exhaustion, etc. are possible. Ideal for workers in construction, carpentry, mining, landscaping, etc. OR for people running, biking, doing yard work, riding motorcycle and more! Ergodyne Chill-Its 6687 Economy Dry Evaporative Cooling Vest - Lime