<p>Sports socks fabrics produced from polyester, polypropylene, their modified forms Thermocool®, Polycolon®, inthree different structures (single jersey, piquet, terry) were investigated for their skin-fabric friction, permeability(air and water vapour), liquid absorption and transfer (absorbency, immersion, absorption capacity, wetbackand drying) properties. According to the results, the effect of structure is dominant for frictional characteristicsbut focusing on the material, polypropylene created a bulkier and lighter structure with lower friction coefficients, an advantage for sports socks. The effect of structure is greater than the material also for some thermalcomfort parameters, e.g. air permeability and absorbency. Focusing on materials, besides their better liquidtransfer characteristics, modified forms of both fibres had worse performances for air permeability and absorbency compared to their standard forms. Absorption capacity, wetback and drying performances were relatedto fabric density besides the polyester’s higher regain capacity. While Polycolon® had superiority for wetbackperformance against standard polypropylene, this was not the case for Thermocool®; however, both modifiedmaterials showed apparent superiority for drying periods. Piquet structures were advantageous for absorptioncapacity and wetback performances for polypropylene. For sports socks parts, specific needs can be met bychanging the fabric structure. Considering the materials, polypropylene and Polycolon® can be recommendedfor both thermal and tactile aspects.<br></p>