The biggest differences between these two models are the fit and placement of the stretch material and the reinforcements. The men's model of the GPx trousers also has a slightly tighter fit than Nordwand. GPx are equipped with reinforcements over the seat, front thighs, double fabric over the knees with room for kneepads, as well as reinforcement on the lower legs. The rest of the fabric is in stretch. Nordwand trousers are stretchy over the seat, front and back of the knees, with the rest made of durable reinforced material overall.