• The largest organ in our body is our skin. We are only able to absorb 15% of negative ions through breathing. But when we use our skin to absorb negative ions, the efficiency rises to 85%.

    (Source: Negatively Charged Electric Ion Treatment.)

  1. 1

What is Teviron & Neoron?

Teviron, invented in Japan by Teijin in 1956, is the commercial name of the fibre that creates high negative static. Born after years of research and development, Neoron is the next-generation negative static fabric with the same functionality with brighter colours and softer texture.

Teijin found Nefful in Japan (1973) to be its marketing & manufacturing arm for Teviron & Neoron, is the world’s market leader in Negative Ion Clothing. Nefful has 6 global offices and independent distributors in more than 20 countries.


  • 4 Key Benefits of Teviron & Neoron


  1. 1


1. Generates High Density of Negative Ions

Comparison Neg Ion Density

When Teviron and wool were rubbed together, static tester shows that Teviron carried negative charge (pointer pointing left) and wool (pointing right) carried positive charge.

In this test conducted by Japan’s “Fiber Industry Testing Institute”, a comparison between major fibers’ electrostatic. Proving Teviron carries negative charge no matter rubbed against which material.

When two items rub against each other, the statics induced would leave one item carrying positive charge and the other with negative charge. You can read more about this Triboelectric effect.

When Teviron rub with other materials, or skin, it generates negative ions. Negative ions have 4 amazing effects which is covered here.

2. Safety/ Non-inflammability

Teviron itself has low flammability because it consist of non-inflammable content, making it very safe to use.

Fire Resistance Association
Fire Resistance Association
*LOI= Limited Oxygen Index
*LOI= Limited Oxygen Index

*Picture and data sources: www.nefful.com.tw

3. Superior Moisture and Water Permeability

Teviron has significant moisture/water permeability and to absorbs minimal water, keeping the wearer warm and dry.

Drifast - Figure 3

The below chart is Teijin’s experiment result. It shows when we perspire, cotton will absorb the moisture and make you feel sticky or uncomfortable; however, Teviron’s absorption is 0, so sweat can be vaporized quickly, and make you feel dry and fresh.

The below chart is a research report done by Carl Marx City Fiber Engineering Institute in East Germany. It shows that during the same time frame, Teviron’s transfusion of liquid is apparently higher than other fibers (Teviron – Column 1 vs Acrylic and Cotton – Column 2 and 3 respectively). Therefore, sweat can vaporize rapidly, leaving dry freshness. We call this feature moisture and water permeability; only Teviron has this outstanding feature.

Drifast - Figure 5

The below chart is Teijin’s experiment report. A person was wearing specialized garment (half side cotton and the other side Teviron), the report shows humidity rate after test subject did some exercise and was sweating. On the cotton side, it took 40 minutes to restore dryness. On the Teviron side, it only took about 10 minutes; which shows superior moisture and water permeability.

Drifast - Figure 6

4. Excellent Heat Regulation

Excellent Heat Regulation - Fig 1
Figure 1 – Insignificant temperature difference in tropical climate but excellent heat insulation in cold temperatures

Teijin Ltd. Osaka Research center used different fiber materials but same thread size and knitting standard to knit several elbow supports. Then they were placed onto test subjects and tested temperature differences between covered and uncovered parts of the skin. Axis Y represents temperature differences; Axis X represents room temperature.

While each material didn’t show great differences less than 25°C, but as the temperature dropped, especially at -5°C, showed significant differences. Teviron has shown excellent temperature preservation as the temperature drops.

Figure 2 (left) – Teviron (Left), Wool (Right) Figure 2 (right) – Cool Colors (Left), Warm Colors (Right)
Figure 2 (left) – Teviron (Left), Wool (Right)
Figure 2 (right) – Cool Colors (Left), Warm Colors (Right)

Figure 2 are the results of an experiment conducted by Teijin Ltd. The right side of the garment was wool, and the left Teviron. A heat detector was used to test the temperature and results were shown through the computer screen (warmer temperature indicates more heat is lost and not preserved in the body).

In Figure 2 (right), when the lab set the temperature at 5°C, the right side with wool has shown warm colors, and the Teviron side has shown cool colors (the warmer the color meant the more heat was lost). Therefore, it proved that Teviron has extraordinary heat preservation to keep people warm in cold weathers.

This is why Teviron undergarments were chosen by the famous Japanese Mountaineer Team to the Himalayas and also by a group of Japan challengers to the Arctic Circle. If you use undergarments and bedding that have insufficient heat insulation, you will feel icy cold, causing blood vessels to constrict, restricting the nutrients and oxygen sent out to the cells.

  • Teviron Fiber’s Major Awards

    since 1959

  1. 1


Oeko-Tex ® Association – certified


Oeko-Tex ® Association test against >100 parameters:

  • – Substances prohibited by law
  • – Substances regulated by law
  • – Currently known to be harmful to health, even if the law did not prohibit/regulate these substances

Test items include: formaldehyde, pesticides, extractable heavy metals, carcinogenic dyes, chlorinated organic carriers, as well as for example preservatives containing pentachlorophenol and tetrachlorophenol.

Okochi Award (1959)
Winner of the honor in the fiber industry
Winner of the honor in the fiber industry
Onshi Invention Award (1960)
Presented by the Showa Emperor
Presented by the Showa Emperor
Chemistry Technological Award (1961)
Winner of the honorary award in the chemical industry
Winner of the honorary award in the chemical industry

Looking to find out more?

Videos of Teviron & Neoron