Muggit Subli-Dark fabric is white polyester, so it sublimates well and breathes when applied to a shirt. It also stretches with the shirt, which increases its washability.
It has a heat activated adhesive on the back, and as an added bonus, it can be cut with a vinyl cutter (subject to certain criteria being met), fabric scissors and even a laser cutter.
The product is available in sheets or running metres.
JG ELECTRONICS 011 789 6033 https://www.jgelectronics.com/