The Hyperkewl Evaporative Cooling Vest is one of our all-time best selling cooling vests. Simply activate in water and wear for an instant cooling experience. Simple V-neck w/ zipper closure Great for a wide range of people and uses Comfortable, quilted nylon outer shell HyperKewl polymer embedded fabric inner Water-repellant nylon liner FEATURES:• 5-10 Hours of Cooling Per Soak• Lightweight and Comfortable Fit• Water Repelent Nylon Inner Liner• HyperKewl Fabric Inner offers effective Active Cooling without any bulging, leaking chemicals or slimy residueThe HyperKewl Khaki Evaporative Cooling Sport Vest is the frontline in the fight against Heat Stress. This lightweight vest uses Patented Hyperkewl Farbic to deliver Super Effective Cooling to all key parts of the body's core. The Lightweight vest can be activated with as little as a 2-3 minute soak and will offer active cooling for 5-10 hours. The Water Resistant innter liner keeps the wearer dry while being cooled. Simple VNeck closure works for a wide variety of people and jobs. TechNiche HyperKewl Products are great to Help You Stay Cool and Combat Heat Stress. TechNiche has the solutions you need to beat the heat while at work, rest and play. TechNiche's Evaporative Cooling Vests provide 5-10 hours of cooling relief per 2-3 minute soaking. They are lightweight, and durable.About HyperKewl Evaporative Cooling: This simple and effective technology works by combining water with our HyperKewl Fabric to create garments that gradually release water through evaporation to keep you cool, but comfortable. Typical applications include personal cooling, outdoor safety, industrial safety, construction, emergency services, military, outdoor recreation, athletics, motorcycling and equine.What is Hyperkewl Evaporative cooling?HyperKewl Evaporative Cooling material is a unique fabric that absorbs and slowly releases water through evaporation. We look at this process as "super-charging" the bodies natural cooling process, thereby protecting the wearer against heat stress. HyperKewl works to cool you during the competition or strenuous activity.Science behind TechNiche Hyperkewl Cooling Vest:TechNiche products are made using our HyperKewl fabric which utilizes a unique chemistry to achieve rapid absorption, stable water storage and controlled evaporation. Hyperkewl fabric allows scientists to create garments that absorb, hold and slowly evaporate the water so that a large amount of water is placed around a user, while they stay dry, and then evaporate it to help “super-charge” the bodies natural cooling method.Human bodies will normally cool itself off through the evaporation of sweat on the skin, with HyperKewl fabrics, adding to this natural process, creating a cooling effect that can cool the user up to 10-15 degree F below the ambient temperature, depending on airflow. (NB High humidity (90%) will diminish the fabric’s ability to evaporate water and therefore provide cooling.) An easy and safe cooling process that simply helps to do what nature has already done, cooling through the evaporation of water. HyperKewl Evaporative Cooling Vest - Sport