. . Why Wool? This 100% Felted Wool Ironing Mat retains heat, so when you iron your fabric it's like ironing from both sides at the same time! Your Ironing Mat works with a variety of fabrics to meet all of your sewing demands. Try your Felted Wool Ironing Mat at any location and create an ironing station that suits your needs! The 1/2in density provides extra protection for any ironing surface. Your ironing will never be the same!.