Mission Enduracool Cooling Bandana 100% Polyester Proprietary technology cools to 30 degrees below average body temperature when wet Typically, bandana cools for up to 2 hours when wet; machine washable UPF 50 protection from the sun When wet, stays cool for hours; when dry, soft and absorbent To activate cooling technology: soak, wring out excess and snap three times; to reactivate, simply re-soak and re-snap the bandana