All products must be used with a Teflon Sheet. Some people prefer to keep the sheet loose and some attach it to the top plate of the heat press. The Teflon Sheet is a double-sided, non-stick, coated, woven fabric that protects the heat press, the products and the garments from the high temperature used when applying products. It also allows for multiple applications of different products onto the same garment without damaging the already existing prints. It is extremely durable, easy to clean and inexpensive. I would not recommend doing any heat pressing without the use of a Telfon Sheet. We sell them 500mm x 400mm, however should you request a bigger size we can cut accordingly.