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GSM

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In short

GSM means grams per square metre. It tells you how heavy a fabric or fibre is for its area. Higher GSM can feel denser. It does not measure spring tension or prove a mattress is better. Compare GSM only within the same material type.

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Close view of a plush velvet headboard and matching upholstered bed
Many bed words describe fabric, shape or storage — this is how they look in a room.

Definition. Grams per square metre — a weight measure for fabric or fibre used on bedding and some mattress cover or fill labels.

See also upholstery depth and GSM.