When working in extreme heat, the body quickly becomes tired and overheated. Active cooling not only improves performance, but also increases the safety of everyone involved. The waistcoat's patented cooling system is activated with just 400-600 ml of water and then provides pleasant cooling for up to three days. The principle is based on the effect of evaporative cooling. Ergodyne's revolutionary Dry-Evaporative technology shields the wearer from moisture and keeps them dry. This significantly increases wearer comfort. The system works efficiently. Depending on external factors (temperature, humidity, etc.), the temperature can be reduced by up to 15 degrees.