The outer layer jacket that is literally built for all seasons, the Black Light 4 Season, is constructed from rugged yet flexible materials such as Gore Tex® and Dyneema® so you know it can take whatever punishment the conditions throw at you. Ideal for mountaineering, ski touring, ice climbing and much more, it's wind- and waterproof, durable, and robust yet it offers great breathability and lightness. It really is a jacket for all seasons.