Ergodyne Chill-Its 6665 Evaporative Cooling Vest - Lime, Large EASY TO USE COOLING RELIEF Activate the polymer-embedded fabric by soaking in cold water for 2-5 minutes. Enjoy instant cooling relief and comfort from the heat for hours. Simply re-soak to reactivate DURABLE AND LONG LASTING Remains hydrated for up to four hours. Just re-soak to increase cooling duration. Hand wash and air dry to reuse multiples times. LIGHTWEIGHT COOLING OUTERWEAR Made with a quilted nylon exterior and an interior water repellent liner that can be worn comfortably over shirt. (Mild dampness will occur after vest is fully activated) VENTILATED COMFORT Shorter length and mesh side panels provide additional breathability and mobility to the wearer. WIDE VARIETY OF USES Reduces the effect of heat exhaustion and fights fatigue while while working or playing in the summer outdoor heat.