This is a 1968 Mustang Convertible Top Boot. This is the Maroon color. This is from Distinctive Specialties and never installed since it was the wrong color. My dad never sent it back and it has been in storage for several years. The material is strong with no wear on the seams. It has the end snaps with reinforced corners, heavy stitching on rolled seams, and reinforced leading and rear edges.

From Distinctive Specialties description:

Our Convertible Boots feature a perfect, smooth fit for two reasons: First, our reinforcement padding is sewn into the cover. This keeps the mechanism from showing, and since they are an integral part of the cover, you do not have to keep track of loose pads. Second, we use an exclusive "multi-directional, cross-linked" backing on all our vinyl. This allows a precise fit (and easier stretching) to the vehicles snaps and a tailored, trim look.