UV-Resistant Knitted Fabric Technology | Sagotex UV-Protection Fabric

Today, the need to protect the skin from sunlight remains a top priority. Besides sunscreen, clothing made from UV-resistant knitted fabrics—such as sun-protection jackets and sportswear—is receiving increasing attention thanks to its convenience and ability to reduce direct exposure to sunlight.

What is UV-resistant knitted fabric?

UV-resistant knitted fabric is designed to reduce the amount of ultraviolet (UV) rays that penetrate the fabric surface and reach the skin. When wearing garments made from this material, users gain an additional protective layer against sunlight—especially useful for outdoor activities or environments with prolonged sun exposure.

The UV protection level of a fabric is measured by its UPF rating, which indicates how much UV radiation the fabric can block. The higher the UPF rating, the better the protection—making the garment more suitable for walking, exercising, or working under the sun.

Not all knitted fabrics offer UV protection. This function depends on various factors: color, thickness, yarn density, knitting structure, and special finishing techniques used during production. Thanks to these elements, UV-resistant knitted fabric provides not only breathability and comfort but also a natural and long-lasting way to help protect the skin from sunlight.

How UV-resistant knitted fabric works

UV-resistant knitted fabric protects the skin through natural properties of the fiber and specific production techniques. Each factor helps reduce the amount of UV radiation that can pass through the fabric.

1. Blocking UV rays through fabric density and thickness

Fabrics with high yarn density and tightly knitted surfaces create a natural barrier that makes it difficult for UV rays to pass through. The thicker and more tightly woven the fabric is, the higher the protection level. This is the simplest yet highly effective mechanism.

2. Reducing UV penetration through color and fiber characteristics

Dark colors such as black or navy absorb UV rays better than light colors. Additionally, fibers like polyester and nylon inherently block UV rays more effectively compared to natural fibers. Therefore, both material and color play important roles in UV protection.

3. Enhancing UV resistance through finishing treatments

Beyond natural characteristics, fabrics may receive additional finishing treatments to improve UV resistance. These treatments help the fabric absorb or weaken UV rays on the surface, enhancing and stabilizing the protective capability throughout usage.

Standards for testing and evaluating UV-resistant knitted fabrics

To determine whether a fabric truly protects the skin from sunlight, testing according to industry standards is essential. These standards help identify the UPF rating—a numerical indicator of how well the fabric blocks UV radiation.

UPF Rating

What is UPF?
UPF (Ultraviolet Protection Factor) indicates how much UV radiation can penetrate a fabric. For example, a fabric with UPF 50 allows only 1/50 of UV rays to reach the skin, equivalent to 98% protection.

• UPF 15–24: Low to moderate protection

• UPF 25–39: Good protection

• UPF 40–50+: Excellent protection

A higher UPF rating means the fabric is more suitable for outdoor or high-sun-exposure activities.

AATCC 183 – widely used in the United States

This standard evaluates UV protection by measuring how much UV radiation passes through a fabric sample under controlled testing conditions. Many sportswear and fashion brands rely on it to verify their product performance.

AS/NZS 4399 – commonly used in Australia and New Zealand

Given the high UV intensity in the region, this standard is considered strict and reliable. It clearly defines protection categories and labeling requirements for sun-protective garments.

EN 13758 – European standard

This standard focuses on user safety and UPF labeling rules. It is essential for products intended for the EU market or export-oriented brands.

Why testing matters

These standards help:

• Ensure the UV-protection function is real and measurable

• Improve transparency between manufacturers and customers

• Support fashion brands and uniform suppliers in choosing the right materials

• Enhance product credibility in the market

Clear standards allow buyers to assess fabric quality scientifically rather than relying solely on visual inspection.

Practical factors affecting UV protection in knitted fabrics

UV resistance isn’t determined only by fiber type or finishing. Many real-world factors can raise or lower the protection level. Understanding them helps users make better choices and use the fabric correctly.

Color

Darker colors absorb UV rays better than lighter ones, reducing the amount of radiation reaching the skin. This is why many sun-protective garments tend to have darker tones.

Fabric thickness and yarn density

Thicker fabrics and those with tighter yarn density provide stronger UV protection because fewer gaps allow UV rays to pass through.

Fabric stretch while wearing

When fabric is stretched, the gaps between yarns widen, allowing more UV radiation to pass through. Tight-fitting shirts may therefore protect less effectively compared to garments with a relaxed fit.

Moisture on the fabric surface

Wet fabric—whether from sweat or water—may allow more UV penetration than dry fabric. This is common during sports or high-intensity outdoor activities.

Washing durability and finishing quality

For fabrics treated with UV-enhancing finishes, effectiveness may decrease over time if the finishing is not durable. High-quality UV-resistant fabrics are engineered to maintain performance after many washes.

Benefits of using UV-resistant knitted fabric

Better skin protection during outdoor activities

UV-resistant knitted fabrics help reduce direct sunlight exposure, lowering the risk of sunburn, discoloration, and long-term skin damage. This is especially valuable for athletes, outdoor workers, or individuals frequently under the sun.

Comfort throughout the day

Unlike thick sun-protective jackets, UV-resistant knitted fabrics remain breathable, stretchy, and lightweight—comfortable enough for all-day wear.

Ideal for sportswear, everyday wear, and uniforms

The combination of practicality and comfort makes UV-resistant knitted fabric suitable for polo shirts, sportswear, golf shirts, running apparel, and corporate uniforms.

Enhancing product value

Garments made from UV-resistant knitted fabric offer better user experience and long-term protection, increasing the product’s perceived value—an advantage for brands and manufacturers.

Durable and long-lasting performance

High-quality UV-resistant fabrics maintain their protective capability even after repeated washing, providing long-term assurance for users.

Conclusion

UV-resistant knitted fabric offers a balance of comfort and protection when spending time under the sun. Understanding its characteristics and the factors that influence performance helps users choose materials that better suit their daily needs.