A 400gsm label should be checked by measuring the weight of a known area of plain, unembroidered fleece. Once the sample mass and dimensions are recorded, calculate its grams per square meter and compare the result with the stated specification. Because embroidery, fabric variation, and testing accuracy can affect the result, request supporting documentation from the manufacturer as well.
\nGSM, or grams per square meter, describes the mass of fabric relative to its surface area. Cut or obtain a flat sample from an unembroidered section, measure its length and width accurately, and weigh it with a calibrated scale. Convert the dimensions into square meters, then divide the sample mass in grams by its area.
\nFor instance, a 10 cm by 10 cm fabric piece covers 0.01 square meters. If that piece weighs 4 grams, the calculated fabric weight is 400gsm. This calculation demonstrates the testing method; it is not a test result for the specific product listed by DOLUXE.
\nEmbroidery thread increases the mass of the area where it is applied. Weighing an embroidered panel therefore measures the combined weight of the fleece and thread, rather than the base fabric alone. Samples should be taken from plain areas whenever possible.
\nFabric weight may vary slightly across a roll or garment. For a more reliable assessment, measure samples from several unembroidered locations and record the source of each sample. Accurate dimensions, an appropriate scale resolution, and consistent handling are all necessary for useful results.
\nAsk the manufacturer whether the stated figure applies to the fleece fabric, a particular fabric layer, or another measurement basis. Also request the applicable test method, permitted tolerance, sampling plan, and the actual measurement record. The available product information does not provide these details.
\nThe total weight of a finished hoodie cannot be used as a direct substitute for fabric GSM. A garment includes ribbing, thread, labels, drawcords, metal or plastic hardware, and other construction components. These items all contribute to the finished product weight but do not represent the mass of the fleece per square meter.
\n| Verification approach | What it tells you | Main limitation |
|---|---|---|
| Weigh a measured piece of plain fleece | Estimated
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