Moisture barrier or thermal barrier seam assemblies where rupture could reduce the protection of the garment by exposing the next layer of the garment, the wearer's station/work uniform, other clothing, or skin
NFPA 1971 Standard on Protective Ensemble for Structural Fire Fighting, 2000 ed. https://www.nfpa.org/Assets/files/AboutTheCodes/19 71/1971-A2006-ROC-Preprint.pdf, (Std: Prot Ens for Stru Fr Fight - Amer) {428 NFC}