OESD Top Cover Permanent Topping Variety PackTop Cover Permanent Topper Top Cover is a permanent opaque topper that helps prevent show through when the thread color contrasts with the background fabric. It also allows the stitches to sit on top of the fabric instead of nestling down in the nap of the fibers. This topper is also great for fleece or heavily textured fabrics. Remove it by tearing away excess. Key Features: Prevents Shadowing: Top Cover prevents contrasting fabrics from shadowing