PFAS.

Fluorinated chemicals used in textiles for water, oil, and stain repellency, and stable enough in the environment to have earned the name forever chemicals. In apparel they sit in the finish on the blank rather than in DTG or DTF ink, so a decorator's exposure arrives with the garment: softshells, jackets, anything sold as water-repellent. Restrictions come through EU REACH, US state laws, and the chemical gates in GOTS and OEKO-TEX, which makes the finish on a blank a question to put to the supplier in writing.