The Evaporative Cooling Hat

Available only from Hammacher Schlemmer, this is the hat that uses evaporation to keep your head up to 30 F cooler than outside air temperature.

Hyperkewl Evaporative Cooling Ultra Cap

Ergodyne Chill-Its 6710 Flames Evaporative Cooling Bandana Triangle Hat - Polymers, Tie Closure 6710 - The Home Depot

HyperKewl Evaporative Cooling Ultra Sport Cap - The Warming Store

NWT MENS Urban Pipeline Boonie UPF 40+ Quick dry BEIGE BUCKET HAT SIZE S/M

Performance Cooling Baseball Hat

The HyperKewl Evaporative Cooling Baseball Cap offers effective cooling for every sport or activity. The Classic baseball style Cap style makes this

HyperKewl 6595 Evaporative Cooling Mesh Baseball Cap with Hook and Loop Closure, Highly Durable, HperKewl Cooling Material, Hi-Viz Lime

Arctic Hat evaporative cooling inner liner retains cool water and vaporizes to keep your head up to 20 degrees cooler than the outside temperature. Simply wet the inner lining, then start feeling cool instantly and stay cool for hours. Arctic Hat also has a built-in radiant barrier to deflect and protect you from dangerous UV rays arctic hat provides 99.89% protection from the sun's harmful UV rays. Arctic hat is adjustable, so one size fits most.