The Dritz Seam Roll - Plaid is a handy pressing tool used for pressing seams open on long and narrow areas, pant legs and other hard-to-reach areas. Use the plaid side, made from 65% cotton and 35% polyester, for woolens, synthetic blends and fabrics requiring low to medium temperatures. You can use the cotton side for cotton, linen and fabrics requiring medium to high temperatures. It prevents impression marks on the right side of the fabric and will give your projects a professional finish.