Compact: the name already suggests its functionality. This spinning process, through a patented suction system, gives greater parallelization of the fibres, which allows to obtain yarns with low hairiness and greater dynamometric performance in terms of resistance and elongation of the yarn. A non-trivial added value, especially if combined with other features such as High Twist, Eco Idro, and Total Easy Care: yarns such as Harmony 4.0 and New Royal 4.0 are well aware of this and, precisely because of the application of these treatments, reach excellent levels of performance.