COOFANDYMen's Hawaiian Floral Shirts Cotton Linen Button Down Tropical Holiday Beach Shirts

What is the fabric blend?

Can you dry the shirt in the dryer? I ordered a size up and it is too large (no time to return)

Rayon is not cotton, it is a man-made fiber made from tree pulp. Is this rayon or 100% cotton? I was rrady to buy 4 new shirts but wont now.

Im in confusion which size to select because according my measurement chest in not 46