A. A snowskirt is as described an extra piece of material (with elasticated edge and snaps) on the inside of a ski jacket that can be fastened to prevent snow from entering at the bottom of the jacket. It acts as an additional barrier against wet or powdery snow, stopping you getting damp while out skiing or snowboarding.
Snowskirts can be integrated into the jacket or detachable which means it can be removed when not required.