The construction of channels to ground water level and the porous structure on the interior of the hill induce natural climate control. This active principle provided the template for the texture of the yarn. Since untexturised yarn is smooth and not air-retentive, it remains cool and lacks any real moisture regulation. Texturisation is the process which turns the material into Macrotermes™. In principle, all yarn can be based on the same raw material, e.g. a polyamide, but still have completely different characteristics. In the case of Macrotermes™, a new product, texturisation causes the formation of pore cavities, i.e. insulating air is accumulated and retained in the interior of the yarn during the manufacturing process. In these cavities a capillary effect is created which actively supports moisture transport. The incorporation of ions in the raw material allows odour-reducing and bacteria-inhibiting qualities to be integrated deep within the fibre structure in every part of the X-BIONIC® Beaver-Shirt. This turns Macrotermes™ into a virtual nanofilament whose interior is fitted with an anorganic bacteriostatic agent. Only when the body temperature rises does the high-performance Macrotermes™ yarn show its odour-neutralising properties. The accumulated ions hinder the spread of micro-organisms. The effect is bactericidal. Allergic reactions are thus excluded.