Introducing Advanced Mountain Kit. The most sophisticated alpine climbing system The North Face has ever created. A specialist series, AMK incorporates apparel, accessories, and equipment. Collaborating with elite athletes, designers, and innovators, the collection redefines high mountain performance. Rethinking the needs of the world\'s best, Advanced Mountain Kit enables alpinists to push the limits of their potential.The AMK L3 Pant is the first insulated layer of the AMK clothing system. Featuring the highest quality 1000-fill RDS ProDown, it achieves an unbeatable warmth-to-weight ratio. This is enhanced by TNF’s all-new 50/50 Down construction. Pairing air-permeable fabric with downproof baffles, it allows increased airflow during aerobic activity. Lightweight, ultra-packable and warm, the L3 Pant helps alpinists excel in extreme environments.