TechNiche®, Evaporative Cooling vest, Powered by HyperKewl™PLUS. Simply soak in water for 1-2 minutes for 5-10 hours of effective cooling. Evaporative Cooling requires some airflow to offer a cooling effect. Machine Washable up to 104F/40C. High mandarin collar for additional cooling relief and sun protection with handy front pockets and zipper closure Can provide 5-10 hours of cooling relief per soaking Ideal for motorcyclists Lightweight, easy to activate and durable Comfortable quilted nylon outer with HyperKewl™PLUS fabric interior, water repellent nylon liner, and black poly-cotton trim