The Skullerz 8947 Lightweight Baseball Hat features the Skullerz 8943F(x) hinged impact-resistant bump cap insert for flexible, breathable protection against bumps, scrapes, bruises and other minor head injuries. This lightweight polyester hat is not stiff or bulky, and also features breathable laser-perforated side and back panels for maximum airflow. Available in 3 sizes—ranging from 6 ¼ to 8 ½—it is designed with a buckle closure and adjustable rear sizing strap for a custom