Stay cool in the heat! The revolutionary Arctic Hat™ features a special reflective barrier that blocks 99% of the sun's UV rays & keeps up to 80% of the heat from reaching your head! It has an evaporative cooling liner that cools instantly when you wet it with water to keep your head up to 20°F cooler than the outside temperature. Great for men and women, this lightweight, breathable hat has a wide brim to protect your neck and face, ventilation panels for air flow, and an adjustable drawstring on top for a perfect fit. Nylon & polyester. One size fits all.