What are the characteristics of long-staple cotton? Long-staple cotton is of good quality, and its fibers are soft and long, generally 33-39 mm, up to 64 mm; the fineness is 7000-8500 m / g, the width is 15-16 microns; the strength is higher, 4-5 g Force / root, the fracture length is 33-40 kilometers; there are many twists, 80-120 pieces / cm.