MISSION Cooling Racer Hat - Small - Dark Grey Whether you're cycling around town, training for a marathon, or hanging outside, 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. With HydroActive Wet-to-Cool Technology, the fabric cools to 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. Engineered with mesh ventilation for optimal breathability. Provides UPF 50 sun protection & cools up to 2 hours. Features a chemical-free band for cooling and sweat management. Includes an adjustable hook and loop tab for a perfect fit. Machine washable & resists unwanted odors for lasting freshness. Proprietary cooling technology will never wash out of the fabric. Universal fit is made for both men and women & provides all-day comfort Machine wash cold with like colors, do not bleach or use softeners; tumble dry low Fabric type Body: 100% Polyester Lining 1: 86% Polyester, 14% Spandex Lining 2: 100% Polyester . Activate & reactivate in 3 steps: wet it, wring it out & wave it.