Adjustable pink train engineer hat. Very good quality, thicker material. 100% Cotton. Touch Fastener adjustment strap on back. Sizing: Assuming at least 1 inch of Touch Fastener connected... Adjustable size is about 21.5 to 23.5 inches inside circumference. You can allow for a couple inches smaller by overlapping the Touch Fastener strap. And, perhaps a half inch more room on the larger measurement because the Touch Fastener should hold okay at the half inch mark.