The Dahlia is a women's boater style hat with a super stiff brim and flat crown. Dahlia is the perfect stiff brim hat and has a spot in every closet, as it will carry over to any season of the year. Size M/L in black and gray and black and S/M in tan The Dahlia has a 3.5" (9 cm) crown + 3.25" (8.5 cm) brim and is made of 100% Australian wool.