Precautions for pre-orders

In principle, we cannot accept cancellations or returns for pre-ordered orders.

In addition, shipping may be delayed due to production circumstances. Please note.


Artisan pattern maker by hand

eco package


BIG FIT, which is recommended for those who want to wear it loosely, uses "DRY MASTER Spun" polyester material with a cotton texture. Due to the large number of fine grooves, the capillary action quickly absorbs moisture and sweat. In addition to this water-absorbing and quick-drying function, it also features anti-pilling properties and easy care. Ultraviolet shielding rate 99.1% UPF50 +, crossover of fashion and sports with water absorption and quick drying It's the material.

  • Reliable MADE IN JAPAN with a commitment to quality
  • The "Dragon" logo, which expresses strength, gives you power.
  • Comfortable material that is compatible with training
  • The quick-drying absorbent material is ideal for hard training
  • Pill-resistant fabric
  • Big fit size that can be worn loosely

■ Product details

- material
(Body: 96% polyester, 4% polyurethane)
- Made in Japan
- Model NO-STR-040

size Length Width shoulder width sleeve width cuff width
M. 74.5 61.8 56 26.4 21.5
L. 76.5 64.8 59 27 twenty two
XL 78.5 67.8 62 27.5 22.5

▼Reference size (in the case of height standard)
M : 160-170cm
L: 168-178cm
XL: 175-182cm

▼ Photo model: Alvaro wearing XL size
Height 178cm Chest 120cm Waist 80cm Inseam 75cm Weight 90kg


▼Hidemasa Yamagishi wearing XL size <br>Hidemasa Yamagishi Height 168cm

*In the case of elastic fabric, there may be errors in size.

Care instructions

*Please refrain from using a dryer as it may cause the print to peel off and the fabric to stretch.

・Avoid using bleach.
・Do not soak, do not soak for a long time or leave it wet.
・Use a net when washing, and after washing, adjust the shape before drying.
・Dye may transfer when washed with water, so wash separately from other items.
・Avoid ironing the printed part.

For accurate care instructions, please follow the precautions listed on the product's washing and quality label.

Find other products
We have created a T-shirt that can be used in a wide range of situations, from gym training to outdoor activities.

Stylish BIG FIT T-shirt

As the name "BIG FIT" suggests, this T-shirt boasts a relaxed fit. The "Dragon" logo that expresses strength is designed to give strength to the wearer, and comfortable materials that are compatible with training are used. It absorbs sweat and moisture instantly, and its functionality is outstanding. The BIG FIT T-shirt with the power of the dragon is recommended for those who want to inspire themselves.

BIG FIT size that can be worn comfortably

This BIG FIT T-shirt has a design that can be used during periods of weight gain and weight loss. It provides a comfortable fit regardless of changes in body shape. Let alone training, I play an active part in the everyday active scene. As a crossover item of fashion and sports, you can enjoy it according to various styles.

Comfortable with quick-drying absorption

This BIG FIT T-shirt is equipped with a "quick-drying absorption function" that has many fine grooves that quickly absorb sweat and moisture. You can stay comfortable during training, reducing stuffiness and discomfort caused by sweat, and cooling sweat after training. In addition, it uses a fabric that does not pill easily and is easy to wash, making it ideal for everyday wear.


This is a discerning piece produced in a sewing factory in Japan. Under strict quality control, careful sewing is applied, and high quality resides in each piece. You can use it for a long time with the technology and quality that Japan boasts. The peace of mind and high quality of MADE IN JAPAN will support your performance in the sports scene.

“I wanted to create a piece that would be excellent both as training wear and as a fashion item.”

A BIG FIT T-shirt that you can wear anytime

3 color variations

WHITE - simple classic color

The standard color "white" for training apparel gives a bright and clean impression.

Navy - Refreshing popular color

“Navy”, which is popular outside of sports scenes, goes well with various colors, so it is easy to coordinate.

Black - chic and mature color

The chic and cool impression of "black" gives a simple and stylish impression.

best dragon line for training

Dragon Series

March 2023. Hidemasa Yamagishi declared his return to the contest. We created a new apparel design line for HIDE YAMAGISHI, which competes in the world with the concept of "challenge" in the future.

Designing the strength of Hidemasa Yamagishi

Origin of dragon

Once called the Bruce Lee of the bodybuilding world, the dragon is now Hidemasa Yamagishi's trademark. As a new line of STIMIRON, we created the "Iron Dragon Logo" with the motif of the dragon that can be seen on the left arm.

STIMIRON's most important point when choosing fabrics

Pursued comfort

I was particular about comfort so that it would be easy to use for training. We wanted a comfortable fabric for dumbbell training, machine movement, and aerobic exercise.

what the dragon shows

Symbol of courage and challenging spirit

What STIMIRON's dragon series expresses is the "spirit of continuing to challenge" itself. The dragon, which is a symbol of strength, power and courage, is central to the design concept.