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Centre-to-selvedge GSM variation occurs when fabric density is not uniform across the width, affecting cutting consistency and garment appearance.

Roll-to-roll GSM variation can change garment weight, hand feel, opacity and consumption, so bulk polyester rolls should be checked before cutting.

Fabric weight tolerance explains how much a fabric's actual GSM may vary from its ordered specification. Learn how to calculate GSM variation, understand illustrative tolerance ranges, evaluate their effect on garment costing, and inspect polyester fabric before bulk production.

Why does a polyester fabric labelled 220 GSM sometimes measure 214 GSM at the edges and 225 GSM at the centre? Learn how fabric tension, knitting structure, heat setting, stenter finishing and relaxation influence cross-width GSM variation. Discover how to test fabric correctly and what bulk buyers should check before garment cutting.