My Tilley Airflo started out khaki --- it's nylon. It's turned a lime-green though from the sun.Love my Tilley nylon had, lightweight and super breathable. Wish it came in tan though, white shows sweat and grime so quick.
They told me there's nothing they can do. Natural color change from the sun....I think they would replace with a new one. that sounds like a fault of the material. Two new additions to the lids category here, outdoor research waterproof hats for me and the wife.