The original Stay Cool Sun Visor Built In Cooling System in Blue. Great idea - just soak the visor in cold water, and there are crystals in the headband which expand and retain the moisture to keep you cool all day. Can be refreshed when necessary, full instructions on label. These really do work!! Great for gardening, golf, tennis - any sport activity, or just lazing around on the beach or by the pool. Can be hand washed in mild soapy water when required. The crystals are non-toxic, medical grade polymer.