http://embroideryauthority.com/heat-transfers/ Advantage over embroidery.
Heat transfers' advantages over embroidery are that it is less expensive to do a very large (such as for the front or back of a t-shirt) design and can be done on lighter fabrics. A large embroidery design, while more expensive gives you the most beautiful product with a higher perceived value.
Heat transfers can cover a large design less expensively. This is a function of capital investment (embroidery machines are much more expensive than heat transfer presses) and time (it takes less than a minute to heat transfer a large design, while a large embroidery design could easily take over an hour to sew).
In addition, we really don't recommend putting large embroidery designs on light fabrics such as polo shirts and t-shirts. Heat transfer doesn't have the push and pull of the needle and thread to distort and wrinkle light fabrics that we put a large design on. Heavy sweatshirts are about the lightest fabric that we recommend embroidering large designs.
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