Pure cotton is not ineffective. But because of the bright colors. You need to use transfer paper. And transfer paper will be a little sticky. It's a little airtight. If you want to solve it. Now, just like here, we usually use lycra fabric. It is more comfortable to wear than pure cotton. And is not easy to deform. Wrinkles Second, transfer paper should be used well. Many people do this just to see the bargain. Cheap transfer paper certainly won't do!