the core 16 is wrapped with a cotton of 28 metric number wrapping consists in covering a core yarn with one or more sheaths consisting of different yarns the monofilament strip 16 is placed under tension in order to be wrapped with a single or double sheath in the specific embodiment the cotton of the first winding provides its solidity and its softness in the case of a double wrapping there may be an outer winding the wrapping fiber 17 is chosen according to its characteristics so that it provides its own qualities heat regulation textured fiber etc in a second example of realization fig7 the core in the shape of a strip 16 for example that obtained and shown according to the process of fig5 is covered with discontinuous fibers 19 the composite yarn 21 is thus obtained according to the dref u2122 friction spinning technique the antibacterial and antifungal properties of various yarns see table 1 below made up of metallic monofilaments silver and copper wrapped with cotton fiber were evaluated the yarns are converted into knits in order to be tested according to the standardized microbiological tests according to swiss standard snv 195 920 a qualitative test which determines the antibacterial activity by diffusion on agar this standard demonstrates the antibacterial activity of a textile support which has undergone a finishing treatment or contains a treated fiber in the mass and which gives rise to diffusion of the active ingredient in the nutritive medium swiss standard.