The factors affecting the surface friction coefficient of knitting yarns are studied. The coefficient for well waxed yarns is up to 50％ lower than for non-waxed yarns. Samples are produced on automatic hosiery knitting machines, using 50 tex waxed and unwaxed cotton yarns at tensions of 5, 10 and 20cN. The yarn properties and the structure of the fabrics are also examined.