Response from MEC:
Both the Ferrata 3 Simplex (5001-337, $115.00 CAD) and the Ferrata 3 Ultra (5000-774, $145.00 CAD) Men's Pants are made from Schoeller Dryskin Extreme fabric, which is a blend of 80% nylon for abrasion resistance, 10% spandex for stretch, and 10% polyester for moisture wicking. Both pants feature 2 hand pockets, 1 small thigh pocket, belt loops, and a fly front with snap and zipper.
However, the Simplex has a tapered leg, to reduce the amount of flapping material below the knee. The Ultra has a near-straight leg, and features a double seat and double knees for even more wear-resistance, as well as drawcords at the ankles, to restrict the entry of debris into the lower part of the leg.