3" Mission EnduraCool Cooling Lockdown Headband. When you need to cool down and look good while doing it, you need the Lockdown Instant Cooling Headband.Cooler heads prevail in our revitalizing lockdown reversible headband. It drops to 30 degrees below average body temperatures when soaked with water, wrung out and snapped.Sounds simple to activate because it is.Built for you to look good and feel better doing all-things-summer.Instant CoolingOne SizeUnisexActivate in WaterWhen wet, stays cool for hoursWhen dry, stays soft and absorbantReusable and machine washableEnduraCool Instant Cooling Technology:Mission's EduraCool is the industry's first cooling material for the textile market. This proprietary technology delivers 3 distinct functions to reduce the fabric's surface temperature up to 30À.1. Wicking2. Circulation3. Regulated EvaporationIn addtion to the cooling benefits, EnduraCool material is significantly drier due to its non-clinging, non-saturated nature. And because it is , the cooling benefits never wash out!