the photo I posted was just sitting there on top of a piece of paper.
The ones we actually pressed on the shirts the client has them.
I don't think you will get a puff effect when using adhesives, more like a raised effect since it is a thicker material than vinyl. Very stiff and tough, that's why it is the number 1 choice on professional tough sports like Football and Hockey etc... so when a player grabs your shirt to pond you one, it will not come off.
You should just order samples from Josh.
the photo you posted may be you are right, no adhesive and just sewed around the edges.