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Efficiently designed to deliver reliable warmth in zero-degree weather, this premier mummy bag is now crafted with water-resistant 650-fill ProDown™ and delivers incredible warmth without weight. ProDown™ is a natural down insulation with a water-resistant finish that absorbs less water and dries faster than traditional down to keep you warmer in cold, wet conditions. Body-mapped anti-compression pads create an insulating buffer in the areas where your body makes the most contact with the ground.
Using only the highest quality goose down in all of our products, The North Face® tests each lot of down at three stages of production for loftiness, moisture resistance and ability to regain loft after compression.
The fill power of goose down is an indicator of two important features: warmth-to-weight ratio and compressibility, both critical to retain warmth and furnish comfort. True fill power is measured by placing one ounce of goose down in a graduated cylinder and measuring the volume the down occupies in cubic inches. The North Face® products are insulated with exclusive, high-fill power goose down ranging from 550 to 900 fill, which represents the highest quality down commercially available.