This hat was designed to keep your head cool by dumping excess heat through special vents that allow hot air out but are small enough that the sun's rays aren't an issue.
Under Armour Men's ArmourVent Adjustable Hat Blue OSFM
Under Armour Iso-Chill ArmourVent Adjustable Cap
Small vents in the Under Armour® Iso-Chill ArmourVent® Bucket Hat dump excess heat to keep you cool while still protecting from the sun. ArmourVent
Under Armour Iso-Chill ArmourVent Bucket Hat
Under Armour Men`s UA Iso-Chill ArmourVent Bucket Hat, D_olive
Under Armour Iso-Chill ArmourVent Bucket Hat
Under Armour Iso-Chill ArmourVent Bucket Hat
Men's UA Iso-Chill ArmourVent™ Bucket Hat
Under armour ua iso-chill - Gem
Buy Under Armour Iso-chill Armourvent Bucket Hat in Castlerock
Under Armour UA Men's Iso-Chill ArmourVent™ Bucket Hat