Felted Wool PRESSING MAT 100% PREMIUM WOOL – MADE IN USA Press any pieced or embroidered block with ease. The density of this high-quality 100% felted wool mat absorbs seams and stitches, effectively pressing both sides at once. Block knitted projects as well by pinning them directly to the mat. An added bonus? The texture of the wool stops fabrics from shifting so there is no distortion when pressing.