On their site they call it a "hybrid" print, but don't give away what processes they have melded together to achieve this. Given that we don't know how these things are made (for sure), and that I (at least) have not used them, it is likely incumbent on you to wash the thing to the point of failure and report back on how many cycles that takes
As to how to get it soft ... some transfers, such as JPSS, start off rather stiff but feel noticeably better after a few washes, though certainly not absent of handfeel. Many other types remain pretty much the same until they fail. Other than using one of those RIPs that fills your art full of unprinted-holes while adjusting the tonal balance for the shirt color that will be showing through those holes, there likely wouldn't be a way to make the print softer.