Among other things, rotor-spun yarns are also used for fabrics that are subsequently napped slightly. These are both fabrics for men‘s and ladies‘ outerwear, so-called flannel fabrics, and also roughened sheets (beaver sheets). Both of these used to be typical products of carded wool spinning, a spinning system that has almost entirely disappeared and been replaced almost completely by rotor spinning. Many of the products mentioned are produced from regenerated fibers, a very low-cost raw material that can be spun superbly on rotor spinning machines, but not on ring spinning machines. Very high-quality and high-priced end products, especially in the flannel sector, can be manufactured from these very inexpensively produced fabrics.