Best Cooling Skull Cap for Men and Woman (Instant)。Designed for everyday activities, from working out to sports games, this baseball-style cap not only keeps the sun out of your eyes and off of your face, but also cools you down instantly when activated with water. Lightweight and breathable, this hat provides UPF 50 sun protection and features a chemical-free band for cooling and sweat management. It also includes an adjustable hook and loop tab for a perfect fit. With HydroActive Wet-to-Cool Technology, our fabric cools up to 30 degrees below average body temperature in under 1 minute & stays cool for up to 2 hours. Activate & reactivate in 3 steps: wet it, wring it out & wave it.