We pull on the La Sportiva Machina Pant when we're spending a day in the vertical world, battling for a send pitch after pitch. The articulated knees, gusseted crotch, and high-stretch upper back insert let us stem and drop-knee freely, while the abrasion-resistant front panels hold strong against sharp limestone. With the waist and hem cinched tight, we get a fit that stays put and out of our way as we toe down on tiny chips.