Reinforcement 4 : An additional layer of a textile material applied to a specific area of the protective garment to make that portion of the protective garment more resistant to wear
NFPA 2112 Standard on Flame-Resistant Garments for Protection of Industrial Personnel Against Flash Fire, 2001 ed. http://www.nfpa.org/assets/files/AboutTheCodes/211 2/2112-A2006-ROP.pdf, (Std: Flame-Resistant Garments for Prot of Ind Pers Against Flash Fr - Amer) {442 NFC}