The single wave shelf is the component from which the double wave is derived. It has a lower sleeping area, fifteen inches deep, with a long wave-shaped upper shelf. It is forty-four inches from side to side and mounts on the wall without special brackets with four large butterfly anchors or masonry anchors (such as Tapcon screws). The required attachment points are attached to the shelf and you supply the anchors for your wall type. The shelf can be ordered in left (shown) or right configuration, which describes which side the sleeping curve is. It comes carpeted (standard) or wood with a clear or light/medium/dark walnut-stained varnish.