Absolutely yes, very important ! The issue of which fabric should be used in which product is extremely important. We just want to give a few examples. Let's say you want to use cotton fabric for the T-shirt. However, not all cotton is of the same quality. Some types of cotton begin to deteriorate quickly after washing. Also, the pressure applied to the fabric will be deformed. The knitting technique of cotton fabric is also an extremely important issue for your product. When you send us your designs, we will be pleased to provide detailed technical information.