Evaporative Cooling Vest - Bodycool BlackNilak Black H20 General purpose cool vest. With INUTEQ H2O technology, comfortable materials and a slim fit, this vest offers great evaporative cooling capacity in the hottest environments. Activation is easy. Just soak in fresh water for max 2 minutes and squeeze out gently any excess water and your vest is good to go again. Instantly creating evaporative cooling up to 8 hours, depending on the ambient temperature, humidity and airflow. The Clifton