MSA10020066 / 10020066 HARNESS THERMATEC SIZE X-LARGE Thermatek™ Welding Harness Ideal for welding and other high heat applications, the Thermatek™ Vest Style Harness is constructed of high-visibility green Kevlar (60%)/Nomex (40%) blend webbing that's resistant to chemicals. It features a back D-ring, 2 hip D-rings and Qwik-Fit leg straps for easy connection. Harness meets ANSI A10.14, OSHA, and CSA Standards.