Does it go all the way around the cuffs and the bottom of the pants? If so then you are describing what is called 'Dragonhide'. Here is a makeup of the fabric.
DragonHide™ fabric weighs 9.7 oz/yd2 (330g/m2) and is made from a blend of 34% para-aramid, 63% aramid, and 3% carbon filament, which is back-coated with a specially formulated polyurethane polymer and impregnated for water, oil, and dirt resistance
Similiar to Seude leather this material is easier to decon, doesn't stiffen with age. This material is being used more and more to protect and prevent fraying/tearing of cuffs, elbow and knee areas on turnout gear.