The top color layer is durable static dissipative vinyl, which has sufficiently low resistance to discharge static-laden conductors, yet will help prevent the shorting of pins on the backs of printed circuit boards laid on the mat. The middle layer is a highly-conductive scrim that provides the main discharge path to ground, and the bottom layer is static-dissipative foam, providing a durable nonskid cushion. - 8200 series dissipative vinyl 3-layer mats and rolls are soft table mats with a 3-layer construction that meet ANSI/ESD S20.20 tested per worksurface standard ANSI/ESD S4.1 and ESD TR53. Compatible with constant monitors.