The Chill-Its 6686 Dry Evaporative Cooling Hat is a lightweight and low-maintenance cooling solution that comfortably manages heat stress. Exclusive dry evaporative technology cools workers’ heads without leaving them wet. Just 3 oz of water in the adjustable gray cap provides up to three hours of dry cooling relief that is 15°F (8.3°C) below ambient air temperature, with a maximum of 59°F (15°C) below ambient air temps. Durable and machine-washable, it even has an anti-microbial treatment to prohibit mold growth.