The Psiphon SL Pants is a very versatile pair of climbing trousers. Arc?teryx altered the design so that it would meet the standards of mountaineering and rock climbing. They used Cresta stretch nylon fabric, which is extremely comfortable and allows for loads of mobility. It is also very durable and well ventilated for optimal comfort. You?ll never feel that your mobility is in any way impeded, thanks to the articulated patterning and gusseted crotch. The Psiphon SL Pants can be adjusted for the perfect fit using a flat belt buckle. The flat construction will also ensure that you won?t experience any unpleasant pressure points, even when wearing a climbing harness. The front pockets are equipped with mesh fabric for more ventilation.