Insert for a Hat

FIG. 1 is a bottom perspective view of the insert for a hat showing our new design in a position of use; FIG. 2 is a front elevation view thereof; FIG. 3 is a rear elevation view thereof; FIG. 4 is a left side elevation view thereof; FIG. 5 is a right side elevation view thereof; FIG. 6 is a bottom plan view thereof; and, FIG. 7 is a top plan view thereof. The broken lines showing the hat in FIG. 1 illustrate environmental subject matter that forms no part of the claimed design.