I recently replaced my first set of trekking poles, a pair of MEC Mantis (discontinued) as the twist lock mechanism would no longer hold my weight, making them essentially useless to me. My next poles would have to feature a truly excellent locking mechanism. I returned to MEC and after comparing all of the poles they carried (almost 20 different models), I settled on the Black Diamond Trail Ergo Cork poles, a set of aluminium poles.
Another nice feature of this specific model are the ergonomically shaped natural cork handles, which are both shock absorbing, cool to the touch and comfortable. As an added touch, a foam rubber grip is also provided below the cork handles, for times when the poles are used on very steep terrain and can't be grabbed as easily in the standard grip.