From the manufacturer

Halo Headband Solar Sun-Protective Skull Cap & Tail

• Pullover design and tail that completely covers the neck and ears for ultimate sun protection
• 4-way stretch micro-mesh top releases heat for year round comfort
• Patented Sweat Seal channels sweat back and away from the eyes and face
• Grip Technology keeps it in place during any activity
• Dryline fabric absorbs sweat, wicks moisture, and dries quickly
• Mesh tail for increased sun protection on your neck
• Will not lose shape, form or stretch out
• Stays in place during any activity
• One size fits both men and women
• Works great under helmets and hats

The Halo Solar Skull Cap with Neck Protection provides all-day comfort and sun blocking protection. It includes our patented Sweat Seal Grip Technology designed to keep sweat out of your eyes. The lightweight tail is a double layer of mesh fabric providing +50 UPF sun protection. This sweatband fits comfortably under helmets and construction hard hats.