The Spyder Propulsion Pant is a featured loaded lightly insulated pant for the man who wants the flexibility of a shell, but a little extra something to take on winter. Just enough insulation to make a difference, not so much you're weighed down, with a thigh vent system to give you more breathability when you're really moving. A really outstanding pant for someone who is looking to own one pair of pants for a variety of winter sports, but doesn't want to be forced into a bulky layering system on a cold day.