We wear La Sportiva Machina pants when spending a day in the vertical world fighting serve after serve. Articulated knees pleats in the crotch area and a highly elastic insert in the upper back allow free bending of the knees and abrasion-resistant front panels stand up to sharp limestone. The waist and hem are cinched tight and we get a fit which remains in place and does not interfere with us when we click on tiny pieces.