Material selection is an important stage in the design of footwear, which determines not only its appearance, but also the comfort of use. The paper presents the methodology for the design of sports textile footwear manufactured by innovative hybrid technology. The upper part of the footwear, designed in CAD and a graphics program, consisted of two elements. Both of them were characterized by a three-layer knitted and embroidered structure. The air permeability and thermal insulation parameters were determined for each layer and for the whole package. The conducted tests demonstrated that the openwork spacer knitted fabric, as a component of the package, increased the air circulation inside the footwear as well as improved the heat transfer outside.

In this study, an optical thermometer based on regenerated cellulose fibers modified with YF₃: 20% Yb³⁺, 2% Er³⁺ nanoparticles was developed. The presented sensor was fabricated by introducing YF₃ nanoparticles into cellulose fibers during their formation by the so-called Lyocell process using N-methylmorpholine N-oxide as a direct solvent of cellulose. Under near-infrared excitation, the applied nanoparticles exhibited thermosensitive upconversion emission, which originated from the thermally coupled levels of Er³⁺ ions. The combination of cellulose fibers with upconversion nanoparticles resulted in a flexible thermometer that is resistant to environmental and electromagnetic interferences and allows precise and repeatable temperature measurements in the range of 298–362 K. The obtained fibers were used to produce a fabric that was successfully applied to determine human skin temperature, demonstrating its application potential in the field of wearable health monitoring devices and providing a promising alternative to thermometers based on conductive materials that are sensitive to electromagnetic fields.

The work comprises a statistical tolerance analysis of human body dimensions using a 3D body scanner and its impact on the value of unit pressure exerted by a compression product on the subject’s body. Model calculations of changes in unit pressure due to the susceptibility of the human body were carried out on the basis of the Laplace law using experimentally determined values of circumferences of particular parts of a female subject, with and without a compression product. Experimentally documented changes in the body circumferences under the influence of a compression garment are one of the reasons for the differences between the intended and actual pressure value exerted by the product.

On the basis of models developed and experimental studies, the impact of a compression garment on average and local changes in unit pressure was analysed. The study was based on the analysis of the results of 3D scans of selected parts of female and male bodies. It was found out that surface pressure exerted by the compression garment leads to some changes in the geometry of body circumferences and in their lengths and, consequently, to a change in the average pressure value, as well as local changes along the circumference. The main purpose of this work was to estimate the size of these changes in the example of selected parts of female and male bodies.