GSM, or grams per square meter, is a measurement of the weight or density of a fabric. It is an important factor to consider when choosing t-shirts as it can affect their comfort, durability, and overall quality. Generally, t-shirts come in a range of GSM, from lightweight to heavyweight. Let's take a closer look at the different GSM of t-shirts. Lightweight T-Shirts: Lightweight t-shirts have a GSM of 130-150. They are made from thin and breathable fabric, which makes them comfortable to wear in hot weather. They are also ideal for layering under a sweater or jacket in colder weather....