Premium Silk Mask

SKU: MASK005_2

¥2,970 ¥5,940

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"Gunma 200" A mask knitted with filament silk processed with MAYUCA®

"Gunma 200" is an original silk moth variety that was originally developed by the Gunma Prefectural Silk Moth Technology Center, and features extremely high whiteness with few knots. Toyoboshi's MAYUCA® processing is applied to this premium yarn, which is difficult to obtain, and it is a washable silk that can be washed and used repeatedly. With WHOLE GARMENT® 3D knitting it has a nice fit and elasticity , you can wear it with a moderate degree of adhesion. In addition to the texture that does not give a fluffy feeling and the smoothness of raw silk stands out, it is also recommended for use as a measure against drying because it has an excellent humidity control function, which is a characteristic of silk.

Free shipping by small mail¹ 

Color white
Material silk 
Thread name MAYUCA
Yarn count
Thread count
(Number of threads)
1 ply
gauge 16G
thickness Slightly thick
weight* 18g
care Hand washable

* Average value of standard size (M etc.). Think only approx. 

size Width (center width) Vertical (longest part)
One 15 13

As this is a knit product, the measured values may differ by a few percent. Also, since it expands and contracts, you can adjust the fit by holding the center and extending it up, down, left and right.

Made In Japan

please note:

  • Masks do not completely prevent the invasion of viruses and pollen.
  • Do not use it for any purpose other than masking.
  • It may have a silk-specific odor. If you are interested, please wash it once before using it.
  • If you feel suffocating, discontinue use.
  • Should you observe any abnormalities on your skin such as itchiness or rash during or after use, discontinue use and consult a doctor if necessary.


  • Hand wash with a mild detergent.
  • Do not use chlorine bleach or oxygen bleach.
  • Rinse the detergent thoroughly.
  • Use a dry towel or other water-absorbent material to gently press to remove water.
  • After dehydration, shape it and dry it in a well-ventilated shade.
  • Do not tumble dry. If you are worried about shrinkage after washing, pull the center part up, down, left and right to shape it.
  • If you lightly iron at low temperature, you will not be wrinkled.

About steps due to stitches:

There may be steps in the ear hooks due to the increase or decrease in stitches, but there is no problem with normal use or strength.

¹ If you order at the same time as a regular delivery (courier) product, the order amount less than 22,000 yen (tax included) will be 500 yen. Free shipping if the total amount is 22,000 yen or more. For more informationHerePlease refer to the.


MAYUCA® Protein Coating:
Patented technology created from the research on spinning technology of cashmere


What is silk

Silk is a natural material made by grinding threads from the cocoons of silk moths (larvae). It has a long history, and it is said that silk fabrics began to be made in China about 4,000 years ago. It has a unique luster and supple texture, and has long been loved by noble people. In addition to the graceful appearance and texture, also an excellent material for practical use as clothing. Because it has excellent moisture absorption and desorption, breathability, and heat retention, it has the advantage of being cool in summer and warm in winter, gentle on bare skin and less likely to cause rashes and contact dermatitis.[1]. In recent years, it has become clear that the silk component is close to the components that make up human skin and can be expected to have useful effects. Not only as a fiber material, but also utilized in a wide range of fields such as cosmetics, pharmaceuticals, and health foods.

Filament and Spun Silk

When you think of silk yarn, many of you may recall the scenes of old silk mills, where fine fibers are unraveled from many cocoons and reeled as they were being pulled out. This is the process of making filament silk, which can be as long as 1,500 meter. Filament silk is the only long fiber (filament) in natural yarn. Refining process, which removes the film called sericin covering the filament, gives it its unique luster and gloss.

In addition to filament silk, there is a type called spun silk (kenboshi), made by spinning. A silk thread made from short fibers that are taken out of a cocoon into a cotton-like shape, spun finely and twisted into a single thread. Compared to filament silk, it is bulky and has a soft texture. Spun and twisted, made in the same process as cashmere spinning, so is a field where our accumulated knowledge can be directly utilized.
Toyoboshi is focusing on production technology for both filament and spun silk. In addition, with an eye on the future of the industry, we are actively participating in research on new silkworm species, and are developing species that produce threads of various fineness.

Processing using natural materials

Silk is popular as clothing, but its delicate nature makes it difficult to wash and vulnerable to friction. In recent years, various types of washable silk have become available on the market. Basically, it is processed to increase resistance to moisture and friction by adding some material or chemical, and most of them are coated with resin.

Since synthetic resin is a plastic material, silk's features such as texture and hygroscopicity may be impaired, and the use of plastic is not very desirable from the viewpoint of environmental protection. The MAYUCA® coating material is a result of trial-and-error process of finding high-quality proteins suitable for silk processing. They are natural materials, of course, harmless to the human body and safe materials that are also recognized as quasi-drugs.

Patented technology developed based on cashmere processing

MAYUCA® is a patented protein coating technology developed by Toyoboshi engineers. So how did that technology come about?

The origin lies in our knowledge and experience in spinning cashmere, responsible for improving the quality of cashmere. Cashmere raw wool is collected from cashmere goats that are raised outdoors, so it is possible to see minute scratches and discolorations caused by wind, snow and sunlight. In the dyeing process, for example, these small scratches can affect color irregularity, color development, and colorfastness (stability), and one of the challenges has been how to improve the yarn surface while maintaining the quality of the raw wool. Our in-house research department, which has been involved in this work for many years, has accumulated a variety of know-how, including detailed data on materials, permeability, possible chemical reactions, and timing of application. Based on thiese, we were able to establish a sophisticated technology to coat the silk surface with protein. 

The key is adding "scale" similar to cashmere

In addition to coating technology, MAYUCA® has further ingenuity unique to Toyoboshi.
A function similar to the cashmere scale (scale-shaped cuticle) has been added.   

Cashmere scale     
MAYUCA® pseudo scale

Animal hair such as wool and cashmere absorbs and desorbs moisture by opening and closing the scale, but MAYUCA® with a pseudo scale has also evolved into a breathing fiber.

The fine protrusions of fibers that silk does not have are added to create bulges in the threads, giving a fluffy texture. By using hydrophobic hard protein as the coating material that composes the pseudo scale and applying the technology to reinforce the inside of the thread, the elasticity of the fiber is increased and the thread has kickback property (elastic recovery property). I am.

MAYUCA® protein coating is a patented technology realized only by Toyoboshi of cashmere spinning.



MAYUCA is a registered trademark of Toyoboshi Industries.

[1]Allergic Reaction may occur depending on the skin sensitivity. Should you observe any abnormalities on your skin, discontinue use and consult a doctor if necessary.

 Length: A Width: B Shoulder width: C Sleeve length: D Sleeve length G Hem width: E AH: F AH2: H



Total length: L West: M Hips: N Inseam: P Hem width: O

For small items, in principle, the value is obtained by measuring the distance of a straight line in a flat position.
As this is a knit product, the measured values may differ by a few percent.
Even products of the same type and size may differ slightly depending on the individual.

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