## 6 Conclusion and Future Challenges  
Compression textile products may be classified depending on the position of the body and the purpose of the compression therapy. The compression therapy efficiency depends on the quality, structure and construction of a product. One of the main challenges that needs to be solved is the lack of uniform global standards defining compression levels. The mechanism of compression therapy action varies depending on the nature of the medical problem (for example, varicose veins, joint damage, injury prevention or treatment, etc. ), and is still not well understood, there are disagreements concerning the ideal level of compression needed to achieve the most significant improvements. The different classificationsof compression products and the standards applied by countries (see Table 3) make it difficult to unify these products at the global level. What is more, if the compression level is wrongly assessed and the product of the supposedly necessary class is purchased and manufactured according to a different standard than the one prescribed by the doctor, the patient's condition may not only not improve, but may even worsen. The methods used to measure the compression of compression products are also different. This means that products designed by different manufacturers for a similar purpose may generate different levels of compression, depending on which compression measurement method and evaluation standard was used to describe the product specification. Therefore, a unified standard defining the compression class is a necessity, considering the level of globalisation of world markets and in order to achieve the best results of compression therapy. Knitted compression fabrics are made by knitting at least two types of yarns together: ground yarn, which ensures stiffness and thickness and elastomeric inlay yarn, which generates compression and helps to achieve better performance of the compression product. The linear density of the elastic yarn does not have an essential influence on compression generation as the compression product is usually used under low elongations (up to 30%), however compression generation increases by increasing the elastomeric inlay yarn insertion density. Knitted orthopaedic compression supports are often designed with additional rigid elements that can be classified into three main groups, depending on the purpose: (a) medical; (b) wearing comfort; and (c) branding. Additional parts inserted into the support may change the elasticity of the entire product even more than 25%. Therefore, the measurement and evaluation of the compression level must be carried out for the final product with all additional, not only functional, but also branding rigid parts. Even more, compression of knitted compression products decreases during the time due to the stress relaxation, and major changes in compression occur during the first 100-200 s. Therefore, evaluation of compression is highly recommended no earlier than after 120 s of stress relaxation. Electro-conductive knitted heating elements used in orthopaedic compression products offer a wide range of benefits, such as flexibility, comfort, feasibility, etc. However, some challenges still remain to be overcome. It is necessary to apply heating of the orthopaedic compression product without adding external elements with increased rigidity, which will impact changes in the compression therapy. In addition, it is difficult to retain the constant heating functionality under mechanical impact, e.g., abrasion or deformation, and wet treatment, e.g., washing. To keep the heating functionality activated from washing stress, strong interfacial bonding between the electro-conductive coating or embedded particles and polymeric fibre is essential. Psychological and physiological barriers to wearing compression products, such as thermal conductivity, and air and water vapour permeability, also have a significant impact on the effectiveness of compression therapy.