T-shirts usually have a grammage of 140-200 gsm. 140 gsm is more of a thin and very light shirt, while 200 gsm can be described as a heavy T-shirt. For our Premium Blank T-Shirts we use 160 gsm (medium light) and 180 gsm (medium weight) fabrics. Our oversized t-shirts come in a slightly heavier quality at 200 gsm . Our organic jersey shirt is even thicker at 250 gsm . The weight of our sweaters and hoodies ranges from 300 gsm to 450 gsm. For most of our hoodies and sweaters we use a heavier 420 gsm Italian Fleece fabric. This material has the advantage of being very robust and durable. In addition, it is heavy and thick enough so that it can do without the usual fluffy inner fleece (unbrushed). Our heavy 420 hoodies/sweaters keep you nice and warm and are lint-free at the same time. In summer we rely on slightly thinner qualities for our sweatwear and do very well with 350 gsm (unbrushed) . If you have any further questions, please contact us by email (team@dirts.eu).