Press seams open on narrow, hard-to-reach areas such as pant legs and press small, curved seams and darts with the Dritz Seam Roll. This tool helps prevent impression marks from appearing on the right side of fabrics and can be used to press sleeves. The plaid side is made of 65% cotton and 35% polyester and the cotton side is made of 100% cotton. Great for use on a variety of fabrics. - Dritz Seam Roll.