A molded insert for attachment to material of a cover intended for outdoor use to cover an article has a front face, a back face, and a plurality of openings through its thickness. Each opening has a larger area in the front face than in the back face, and is formed so that the bottom-most extent of the smaller area in the back face is higher than the bottom-most extent of the larger area in the front face of the molded insert, when the molded insert is placed in a vertical orientation. There may be a first region in the molded insert where there are no openings formed. Typically, a peripheral margin is formed around the periphery, and an upstanding wall portion extends forwardly of the peripheral margin at least in the top region when the molded insert is placed in a vertical orientation.