12” x 18” by 1/2” thick wool pressing mat is the ideal thing to press flat quilt blocks and embroidery designs. Because of its dense construction, it’s like pressing fro both sides at one time! Run your iron over the wool mat and it will absorb and retain the heat. Then place your fabric on the mat and iron from the top side. Because the wool mat is heated, you are in effect pressing from both sides. The Hottest new notion! All puns intended!