g/m² means grams per square meter and is used to describe how much material is in a fabric. When talking about wool, g/m² indicates how dense or light a wool quality is. A lower weight usually means a thinner and lighter material, while a higher weight typically means the fabric is thicker, denser, and often feels warmer.

For wool garments, weight in g/m² is a good way to understand how the material is intended to be used. A lighter weight often works well for base layers, t-shirts, and garments worn close to the body, while a higher fabric weight is better suited for mid-layers, sweaters, or outerwear where more warmth and structure are needed. However, g/m² doesn’t tell the whole story of how the garment feels, as knitting, fiber, and construction also have an impact. Therefore, it’s best to see grams per square meter in wool as a guideline for the material’s weight and intended use.