Invented in Thailand: world's best tropical hat

World's greatest hat for hot weather. Perfect shade and ventilation. Additional bonus factor: the layered structure of the hat provides an extra R value of about 0.5, so that significant temperature drop occurs between the outside and inside of the hat. Example: today with an air temp of 30, the outside of the hat had a temp of 38 (from solar heating) and the inside surface was 33. Would addition of a little foil on the underside of the hat improve things?

Invented in Thailand: world's best tropical hat

World's greatest hat for hot weather. Perfect shade and ventilation. Additional bonus factor: the layered structure of the hat provides an extra R value of about 0.5, so that significant temperature drop occurs between the outside and inside of the hat. Example: today with an air temp of 30, the outside of the hat had a temp of 38 (from solar heating) and the inside surface was 33. Would addition of a little foil on the underside of the hat improve things?