Incredibly versatile, the Altitude women’s down sleeping bag is snug and cozy when it’s cold outside, cool and ventilated when the weather warms, shaped to match your natural sleeping position for comfort anytime, and light enough to carry anywhere. It could just be the perfect sleeping bag for women adventurers. Thermolite insulation in the foot section warms your feet instantly. Down chambers filled using body-mapping to maximize warmth for a woman’s physiology. A wider shape between hips and knees to allow you to sleep in a natural position without compressing the down insulation and creating cold spots. . Shorter overall length and narrower girth in shoulders to reduce dead space and increase thermal efficiency. ULTRA-DRY Down 750+ Loft 90% Down Cluster Premium Duck Down certified Responsible Down Standard (RDS). Thermolite insulation in the foot section warms your feet instantly. Free-flow zipper system: full-length YKK #5 main side zip, half-length opposite side zip, and foot zip provides unparalleled ventilation and use as a comforter. Internal pocket for phone / GPS / valuables. Form a snug double sleeping bag by zipping to any Ascent, Trek or Traverse sleeping bag. Shaped hood, oversized draft collar, and zipper draft tube keep the cold out and the warmth in. Includes lightweight Ultra-Sil compression bag and storage cell. Ultra-Sil compression bag and storage cell. INSULATION: Ultra-Dry Down 750+ Loft. SHELL FABRIC: Lightweight 20D Nylon Shell. ZIP OPTIONS: Free-Flow zipper system. MAX USER HEIGHT: 5ft 7in. BAG WEIGHT: 2lbs 6.1oz / 1080g. COMPRESSED VOL (ASTM STANDARD): 6.5 L. COMPRESSION SACK: 10L to 3.3L. FILL WEIGHT: 18.3oz / 520g. SEASON RATING: 2.5 Season. WOMEN’S TEMP (EN RATING): 25°F / -4°C.