Mud flap hanger is disclosed which includes a post member that is configured to allow attachment of the hanger to a vehicle and a hanger arm extending from the post member having a flexible core of a composite material, for example, a fiber-reinforced plastic (FRP) and that is clad with a substantially inelastic polymer. Preferably, the hanger arm is formed with a cross-section shape of a polygon so that clips for hanging the mud flap from the arm may be conformed to that polygonal shape.