THE MATERIAL
The collar label almost always states "100% polyester" or "100% PES" - which means the same thing. Polyester fibres are spun into yarn and processed into various knitted fabrics. Their properties differ depending on the fibre thickness, fibre structure (Coolmax fibres, for example, have furrows in the longitudinal direction) and type of knitting. The fibre thickness or structure of a jersey cannot be determined by sight, but the type of knit can. Fabrics that are labelled as "two-ply" differ on the inside and outside: the structure on the inside is somewhat coarser than on the outside. Due to capillary forces, perspiration is absorbed particularly quickly from the coarse to the fine gaps - away from the skin and towards the outer surface, where it evaporates in the cooling wind instead of lying soaking wet on the skin.