Not all polyurethane heat transfer films are the same. That s because many of these films aren t 100% polyurethane. Instead, the polyurethane based films are blends of polyurethane and vinyl. These blends are stiffer. 100% polyurethane heat transfer films, on the other hand, are more stretchy than others. That’s a big advantage after the graphic is applied to...
http://supply55.com/blog/2013/10/cutting-and-weeding-tips-for-heat-transfer-films/