Techniche HyperKewl High-Collar Deluxe Sports Cooling Vest - BLACK- MEDIUM High mandarin collar for additional cooling relief and sun protection Handy front pockets, and zipper closure; designed bikers, landscapers, oil field, and bicycling Provide 5-10 hours of cooling relief per soaking; lightweight, durable, and washable Comfortable, quilted nylon outer with HyperKewl polymer embedded fabric inner, Water-repellant nylon liner - black cotton-poly elastic trim