Wooly Felted Wonders Ironing Mat 13.5 in. x 13.5 in. – Get beautifully flat embroidery and pieced blocks. Mat is all natural, tightly felted, 100% wool with the natural ability to absorb heat. It’s like pressing on both sides at the same time, with or without steam. The density of the .5 in. mat keeps heat and steam from transferring through to the surface below. Rounded corners keep wear and tear to a minimum and extend the life of your mat.