Blackbird's Birdboy Knit Cap is a replica of the one wore by the real Bird Boy of Ballard (not real). It is/was a tight knit small ribbed cap with four tucks in the crown. Our replica features a removable Blackbird signature Birdboy pin that can be detached and worn on your bag or lapel any day of the week and a satin ribbon with a poem explaining the events that resulted in his death. 100% acrylic