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Cake day: July 11th, 2023

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  • I misstated the definition a bit, although in real world terms a higher GSM does often manifest as a thicker cloth. GSM stands for grams per square meter. It measures how much fabric weighs in a given area. It is a weight rating, not a thickness rating.

    Higher GSM means denser, heavier fabric. Lower GSM means lighter, more breathable fabric.

    General guide:

    120–140 GSM = lightweight (summer sheets, thin shirts)

    150–170 GSM = medium weight (jersey sheets, linen duvet covers)

    180–250 GSM = heavier weight (flannel, winter bedding)

    GSM helps compare feel and durability across materials, but thickness will vary by fiber type.