Two polyester fabrics can have nearly the same GSM but feel very different against the skin. One may feel cool and light, while the other feels warmer. Thermal conductivity is one part of that difference.
What Is Thermal Conductivity?
Thermal conductivity describes how easily heat moves through a material. In fabric, the result is influenced not only by polyester fibre itself but also by the spaces between yarns, fabric thickness and trapped air.
Why GSM Alone Is Not Enough
A dense thin knit and a bulky textured knit can weigh the same per square metre. The bulky fabric may trap more still air, which changes heat transfer. The dense fabric may conduct heat away from the skin more quickly at first contact.
Factors That Change Thermal Feel
- Fabric thickness
- Knitting or weaving density
- Yarn bulk and crimp
- Air permeability
- Moisture and surface finish
Why Buyers Should Care
Thermal behaviour matters in activewear, uniforms, jackets, base layers and hot-climate clothing. A GSM target alone cannot guarantee comfort.
Practical Evaluation
Compare fabrics in their finished state. Consider thermal testing together with air permeability, moisture management and thickness. Wear trials are also useful because real comfort depends on movement and sweat as well as dry laboratory values.
Final Takeaway
Similar GSM does not mean similar thermal comfort. Fabric structure and trapped air can change how quickly heat moves through polyester, so buyers should evaluate the complete construction.
Need Help Choosing Polyester Fabric?
Send Walrus – Yes India Can your garment type, GSM, DIA / width, colour, quantity and end use. We can help shortlist suitable polyester fabrics for bulk production.
Call / WhatsApp: +91 90472 77722 / +91 90420 77722
Website: yesindiacan.in
