Abstract: A blanket comprising a blanket panel having an interior region, a first major surface, a second major surface, and an outer perimeter. A throat aperture is positioned in the interior region of the blanket panel, wherein said throat aperture provides open communication between the first and second major surfaces of the blanket panel. The aperture is of a sufficient size to allow the obstruction to be positioned in the throat aperture in a manner such that the obstruction can pass through the throat aperture from one major surface of the blanket panel to the other. A channel extends from the throat aperture to the outer perimeter of the blanket panel. The channel has an open configuration and a closed configuration. In the open configuration, the channel provides open communication between the outer perimeter of the blanket panel and the throat aperture to allow the obstruction to be passed through the channel and positioned in the throat aperture.