Abstract: An insert device for a hat includes an elongated main body that is constructed from a malleable and waterproof material. A lip extends upward from the main body and includes grippers for engaging the inside panel of a hat. The lip folds independently to the main body. A liner is provided along the back surface of the main body. The liner is constructed from a moisture wicking material and functions to draw sweat from the forehead of a user wearing the hat. A foam insert is positioned between the liner and the main body. The insert is provided in different widths to allow the spacing between the liner and the user to be adjustable.