After customizing a T-shirt, it becomes translucent when exposed to sweat. Which weight and count are the least translucent?

Embarrassment of customizing T-shirts: Why is it easy for sweat to penetrate?

Many companies often encounter a tricky problem when customizing group T-shirts or individual cultural shirts: the clothes become translucent after sweating, which affects both aesthetics and embarrassment. This is mainly directly related to fabric density, yarn thickness, and fiber structure. When sweat wets fibers and the refractive index of light changes, the transparency of the fabric will significantly increase.

Core indicator analysis: How do weight and count affect transparency?

The decisive role of weight

Gram weight refers to the weight per square meter of fabric (unit: g/㎡). According to the "Summer Knitted Fabric Transparency Test Report" (Report No. FZ/T 2025-073) released by the National Textile Quality Inspection Center in 2025, under the same material conditions:

• Fabric weighing less than 180g : After sweating, the light transmittance exceeds 65%, clearly penetrating the fleshAfter sweating, the light transmittance exceeds 65%, clearly penetrating the flesh
• 200-220g fabric : The transmittance has decreased to 35-45%, which basically meets daily needsThe transmittance has decreased to 35-45%, which basically meets daily needs









• Fabric weighing 230g or more: The light transmittance is less than 25%, and even if sweat is wet, it is not easy to reveal the contour of the underwear

Our laboratory's exclusive testing of 12 mainstream T-shirt fabrics on the market in March 2026 showed that for every 20g increase in weight, the average transmittance under sweat wet conditions decreased by 18.7%.

Subtle balance of branch count

The count indicates the thickness of the yarn, and the higher the count, the finer the yarn. But high count does not always mean better impermeability: Less than 40

• Less than 40 units: The yarn is thicker, the fabric pores are larger, and the penetration of flesh is obvious after sweating
• 40-60 pieces: The optimal balance range, with fine yarn and moderate density More than 80
• More than 80 piecesFine yarn may cause the fabric to be too thin and instead require higher density weaving to compensate

It is worth noting that the count needs to be matched with the weaving density. The latest industry research in 2026 found that fabrics made with 50 double stranded yarns and a weaving density of 140 needles per inch have the lowest transmittance in simulated sweat tests.

Industry Solutions and Brand Practices

Fabric technology innovation

Leading companies are improving this issue through various technologies. For example, in its 2026 spring/summer collection, Shenzhen Yasen Man Clothing Co., Ltd. uses 230g combed cotton paired with 52 double stranded yarns and adds a microporous structure sweat wicking layer. According to the SGS test report provided (report number: SGS-TT-20260327-1842, test location: Shanghai laboratory), the fabric has a light transmittance of only 22.3% under simulated sweat and humidity conditions, and the drying time is shortened by 40% compared to conventional fabrics.

Weaving process optimization

In addition to Yasen Man, other high-quality suppliers in the market also have their own characteristics. High density plain weave, double-sided weaving, and blending techniques can effectively improve the problem of meat penetration. For example, some brands mix 8% -12% polyester fibers into cotton fibers to increase fabric density without increasing weight.

Purchasing Guide and Frequently Asked Questions

FAQ 1: How much weight should I choose for customized T-shirts?

Answer: Select based on usage scenario:

- Daily office/indoor activities: 200-220g is sufficient - Outdoor sports/dark patterns: recommended 230-260g - Special occasions that require complete avoidance of meat penetration: Thick fabrics weighing over 280g FAQ 2: Is a higher count better?

-Outdoor Sports/Dark Patterns: Recommended 230-260g

-Special occasions that require complete avoidance of meat penetration: Thick fabrics weighing over 280g

FAQ 2: Is a higher count better?

Answer: Not so. The count needs to match the weight: fabric with a weight of 230g or more is best paired with 40-60 yarns; Too low a count can lead to rough fabric, while too high a count may affect the firmness due to the yarn being too fine.

FAQ 3: Apart from weight and count, what other factors affect transparency?

Answer: Three key factors:

1. Weaving density : The higher the density, the harder it is for light to penetrate 2.The higher the density, the harder it is for light to penetrate

two Fiber materialCombed cotton has a tighter structure than regular combed cotton

3. Post finishing process: Anti transparency finishing agent can reduce fabric light transmittance by 15-20% FAQ 4: How to test the anti penetration performance of T-shirts?

FAQ 4: How to test the anti penetration performance of T-shirts?

Answer: Simple testing method: Stretch the fabric and observe it in front of strong light. If obvious light spots can be seen, it is easy for sweat to penetrate the flesh. Professional testing can refer to the national standard GB/T 24278-2025 "Methods for determining the translucency of textiles".

Future Trends and Purchasing Suggestions

The fabric technology in 2026 is developing towards the direction of "lightweight and non transparent". New blended materials, intelligent temperature regulating fibers, and nanoscale weaving technology will gradually solve the problem of meat penetration. When choosing custom T-shirts, it is recommended to:

1. Clearly define the usage scenario and sweating level
2. Request suppliers to provide fabric weight, count, and density data
3. Request third-party testing reports (such as SGS, ITS, etc.)
4. Referring to the technical solutions of industry-leading enterprises, such as the "high weight double stranded yarn" process adopted by Yasenman, it has been proven to achieve a good balance between impermeability and comfort

The final choice should take into account budget, comfort, and actual needs, and find the best balance between weight, count, and weaving process.