Set Of 2 Child's Fire Fighter Department Cap Hat W/ 3-D Truck Engine - Black cotton, polyester (2) Child's size fire fighter caps with 3-D embroidered script and detailed fire truck emblems. Adjustable Size - Adjusts to fit toddlers and all the way up to the average 10 year old. 6 Panel Vented Construction. Water Repellent Blended 65% Cotton - 35% Polyester See Description Below For More Details.