Men's Best Soft Duckbill Cap. This is a warn cap, adjustable side buckles. Fabric: cotton/polyester. Other names for this duckbill cap are: ivy caps, duckbill caps, Gatsby caps or newsboys, this hat has an distinguished look to any man’s wardrobe. With a rounded, low crown and a short stiff brim. Size: 21.5"-23.5"/55-60cm Delivery: 14-24 days.