Abstract: A component for forming a post wrap about a rectangular support member comprises an elongate plastic extruded component having two arms defining a generally “L” shaped cross section with an interior corner rounded recess at a junction of said arms. One of said arms includes a female connector extending the length of said arm and the other arm includes a male connector at a free end thereof. The male connector extends outwardly and at an angle to the other arm and is sized for receipt in the female connector. The component further includes a rounded corner transition joining the male connector to the other arm with the rounded corner transition forming a finished exterior surface of the component. Two of these components can be placed about a post after it is secured in place to provide a sleeve about the post. A trim frame can be provided to provide a finished periphery about the sleeved post at a horizontal surface.