In the dead of winter, when it gets really cold and the wind is howling, an insulated knicker midlayer is a must. The AEROLIGHT^™ insulated knicker is the ultimate in performance for active comfort with a lightweight stretch insulation that doesn’t absorb water. The KÜHL AIR^™ shell is highly breathable, stretchy, and water-repellent nylon that creates a wind barrier yet breathes so you won’t overheat. Superior stretch combined with our 3D articulation for a fit MATCHED BY NO ONE^®.