Dense New Zealand wool retains heat and moisture so fabric presses from both sides at once, speeding block assembly and improving seam accuracy. The 14 × 14 in surface is portable yet roomy for piecing and appliqué, while the ½ in (13 mm) thickness keeps fabric stable and helps prevent stretching. Pin projects for blocking, then store the mat flat after use. Avoid steam, do not place on a cutting mat, and do not roll or fold the surface after pressing.