Lil' Boo 5-panel. The cap has a large square brim to protect against the sun. It has a Sports Velcro closure and is easy adjust in size to ensure a perfect fit. The high-performance sports Velcro makes it both comfortable and durable for even the roughest little. The sweatband is super soft made from a milk protein called Q-Miltch. Q-Miltch is not only soft but also has a natural antibacterial effect and is more than double as sweat-absorbent as a normal sweatband keeping heads clean and dryM 1. 5-4 years (49-52 cm)L 3-7 years (52-55 cm)XL 7-14 years (56-59 cm)