The Mega Pressing Mat creates a perfect pressing surface for your embroideries, quilt blocks, garments, and more. Use with or without steam for a professional result. Because of its dense natural fiber construction, it holds the heat as if pressing your project on both sides at the same time. Place it near your sewing machine to save trips to the ironing board. The large size is perfect for large quilt blocks and all your other sewing projects. This 14in by 24in BY ½ thick pressing mat is large enough for your 12in quilt blocks and extra-large embroideries. The American made 100% wool composition hold the heat of your iron. It's like pressing from both sides at once!