Fabric weight is measured in grams per square meter or grams/m2 (also abbreviated as GSM). GSM is the metric measurement of the weight of a fabric, it is a critical parameter for any textile product. The weight may affect density, thickness and many physical properties of the fabric, such as strength. GSM is accountable for the linear meters and specific use of the fabric. The fabric weight is measured in grammage. Grams per square meter(GSM), In the metric system, the mass per unit area of all types of textiles is expressed in terms of grams per square meter (g/m2).