Use MiraCool™ technology to keep your neck or head cool all day long. Cooling crystals absorbs to work with the evaporation process in keeping pulse points feeling cool. Soak in cold water 10-20 minutes before use. Shipped from a variety of colors and patterns for fun, attractive and convenient cooling. MiraCool™ Headband is designed for one-size-fits-all comfort around the head as well as quick and easy tying, so it incorporates more length than the bandana. Keep cool all day with a MiraCool™ Hard Hat Insert. Navy fabric hides dirt, and it's easily installed and removed.