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Understanding GSM in Textiles: Choose the Right Fabric TL;DR: GSM measures fabric weight per square meter, not quality or thickness. Different fabric types with identical GSM can have vastly different feels and uses. Using GSM alongside fiber content and weave helps select suitable fabrics for projects. GSM is one of those terms that gets tossed around constantly in fabric descriptions, yet most people misread what it actually tells them. It’s easy to assume a higher number means a better or thicker fabric, but that’s not quite right. GSM measures weight per unit area, not quality or th …