Iron-on tape has thickness 0.17 mm. The top foil protects the reflective layer, fist iron the tape over piece of fabric then peel off the protective layer.
Recommendation: Iron without steam through the fabric for 30 seconds, set at middle temperature. After cooling down, remove the foil, then iron over it for another 10 seconds. First wash after 48 hours.
This item is not intended as a safety feature.