The doctoral thesis deals with investigating protective properties of functional textile products to be used for the protection against electromagnetic radiation of various types. Interlining fabrics with copper coatings have been selected for the purpose, as well as knitted fabrics with silver-treated yarns and a fabric with inox fibres. Since the article of clothing acquired added value with the incorporation of interlinings with protective properties, the investigations described included the imitation of men's jacket front, constructed from basic fabric, adhesive interlining, and interlining with functional properties from the impact of electromagnetic radiation and conventional lining. The protective efficiency of the textiles against electromagnetic radiation was tested prior to processing, after ironing and pressing and after professional care, as it was necessary to establish product properties and resistance in the course of the manufacturing process and subsequent care. Protective properties of the products described, as well as their fastness after a treatment in an aqueous medium and perchlorethylene were tested at the microwave frequencies of 0.9 GHz, 1.8 GHz, 2.1 GHz and 2.4 GHz. Surface characterisation of all the tested samples was additionally made, using scanning electron microscopy, and their tensile properties were also tested. The results obtained confirmed good protective properties from the impact of electromagnetic radiation of the copper-coated interlinings and silver-treated yarns in the frequency range tested. Rather poor fastness of the protective properties on the tested samples after treatment in aqueous medium and perchlorethylene was noted. Microscopic images of sample surface showed cracks in copper coating and damages in silver coatings occurring in the media, which resulted in reduction of protective properties of the functional interlinings. Cumulative impact of solvents in 10 cycles of care resulted in practically complete loss of protective properties in the copper-coated interlining, and reduction of the properties in knitted fabric with silvertreated yarns. Functional woven fabric with inox fibres incorporated in the weft direction exhibited protective properties of the level and fastness inferior to the properties of interlinings which protect, at the tested frequencies of electromagnetic radiation.