The increasing number of people involved in outdoor sports in China has contributed to the further development of functional fabrics. Due to these two characteristics, the requirements for garments are relatively strict and harsh, and no single natural or chemical fibre can meet these requirements, but only the composite of multiple fibres and multi-channel chemical finishing can make the fabric achieve these functions as much as possible.
　　Warmth retention
　　Outdoor sportswear must be both warm and lightweight in order to meet the special requirements of outdoor sportswear. The most common method is to add special ceramic powders containing chromium oxide, magnesium oxide and zirconium oxide to the spinning liquor of synthetic fibres such as polyester, especially nano-sized micro ceramic powders, which can absorb visible light such as sunlight and convert it into heat energy.
　　Water and moisture permeability
　　Waterproof breathable clothing is the use of the surface tension properties of water, in the fabric coated with a layer of PTFE (and the "king of corrosion-resistant fibres" of PTFE has the same chemical composition but a different physical structure) to enhance the surface tension of the chemical coating fabric, so that the water droplets as far as possible to tighten and not spread, soaked fabric surface, thus It cannot penetrate the pores in the fabric tissue. At the same time, the coating is porous, so that water vapour in its monomolecular state can pass through the capillary pores between the fibres and onto the surface of the fabric.
　　As well as thinking in terms of fibres and coatings, the fabric structure can also be made as moisture-wicking as possible. For example, with a two-layer structure, where the inner layer of the fabric is made up of hydrophobic fibres and the outer layer of hydrophilic fibres, perspiration is transferred from the skin to the inner fibres by capillary action.
　　Anti-bacterial and anti-odour properties
　　Formal outdoor sports clothing is chemically finished with an antibacterial and anti-odour finish. For example, aromatic oil extracts such as aloe vera, mugwort, eucalyptus leaf, rose and other aromatic oils with bactericidal effects are used, which are coated in porous organic microcapsules or porous ceramic powder and attached to the fabric, and then cross-linked and fixed with resin. This type of natural antimicrobial agent is not only non-toxic and harmless, but also has certain health care functions, which should be the development direction of antimicrobial finishing. However, as the means of fixing antimicrobial agents are currently limited, the antimicrobial agents are not sufficiently resistant to washing, and the antimicrobial performance decreases somewhat with each wash, generally disappearing completely after a few dozen washes.
　　Stain resistance and ease of removal
　　Outdoor sports often involve walking through muddy, damp mountains and forests, so it is inevitable that clothes will get dirty, which requires that the exterior of the garment be as unstainable as possible and easy to wash and remove once stained. The "three-proof finishing" (water, oil and stain repellent) is a more practical and effective means of advanced chemical finishing, commonly used in the outer layers of garments and in the finishing of fabrics for backpacks, shoes and tents. Fabrics that have been treated with nano-fouling technology are self-cleaning fabrics. Clothing made from such fabrics has a high degree of water and stain resistance, and washing resistance is greatly enhanced.
　　Anti-static and radiation resistant finish
　　Outdoor clothing is mostly made of chemical fabrics, which is why static electricity is such a problem. If you carry sophisticated electronic equipment such as an electronic compass, altimeter, GPS navigator, etc., it is possible for the static electricity in your clothing to interfere with the error, with serious consequences.
　　There are two main ways of finishing the antistatic fabric: one is simply to weave in the fabric into the wire, made of conductive fabric (but also electromagnetic wave shielding fabric and anti-radiation fabric), the friction generated by the static electricity conduction in time to escape to the outside world. However, this type of fabric is not suitable for sportswear, mainly because it is not flexible enough to be comfortable. Another method is to use block polyether, polyacrylate and other antistatic agents with a moisture-absorbing effect, to coat the surface of the fabric with a layer of chemical film that can adsorb water molecules, so that the surface of the fabric to form a continuous layer of conductive water film, the static electricity conduction to dissipate.
　　The penetrating power of ultraviolet light is very strong, and the average fabric is not completely shielded from it. UV shielding agents such as nano-sized inorganic titanium dioxide (TiO2) and nano-sized zinc oxide (ZnO) and organic UV absorbers such as salicylic acid, cyanoacrylate, benzophenone and benzotriazole are fixed to the fabric by means of resin cross-linking, which can play a certain role in radiation protection.