Hot-peel film.

DTF transfer film built to come off the garment immediately after pressing, while it is still hot, where cold-peel film has to cool first. Peel a cold-peel film hot and it lifts ink with the backing; let a hot-peel film cool and the release turns unpredictable. Film behavior differs by supplier, so a film swap means a test press before the run, not a reject pile after it.