A wide brim hat is vacuum formed from a thin sheet of specially formulated PVC plastic. The PVC effectively blocks transmission of both WVA and UVB radiation and thereby provides significant protection against the sun. A removable elastic headband centers a wearer's head within the hat and spaces the wearer's head from the crown of the hat. In this manner, cooling air passages are provided between the wearer's head and the interior of the hat crown.

 
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