Blueprint - Walrus Hats Navy Polyester Kids Ivy Cap (Toddler, Boys, Youth)Ivy caps have long been worn by train conductors and those who shovel coal into the furnace for the conductor (once known as a Fireman). So get your little one something to sport while they play with their toy trains so they can look and feel just like a conductor! The Blueprint consists of 100% polyester, features an elastic rear band, grosgrain sweat band, removable Walrus Hats side pin and a polyester lining to ensure a comfortable wear.