Sometimes the sickest lines are the only lines, because there are rocky faces on both sides, and The North Face Men's Sickline Pant thrives in places like those. Apart from extreme waterproof, breathable protection, the Sickline's HyVent Alpha shell has a mechanical stretch in order to improve mobility. Fully taped seams enhance waterproofing by preventing a single snowflake from seeping through. The North Face also equipped the Sickline with its proprietary Chimney Venting system, which includes long zippers inside each thigh to circulate ventilated airflow throughout the pant. There are stretch gaiters with grippers and boot hooks for additional security, and the waist's clip integration connects to compatible ski jackets by The North Face. This pant also has a cargo pocket with an internal pocket specially designed for smartphones.