Ascent AcI 25F

$398.95 - $418.95
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Roomy yet compact down bag with great ventilation

The Ascent down sleeping bag redefines what versatile means in a sleep system. Complex construction and high-quality down keep you warm when it’s cold outside, while the triple-zipper Free-Flow Zip™ system ensures you stay cool and ventilated when the weather warms. Shaped to allow a natural sleeping position for comfort, the Ascent is light and compact enough to go everywhere your adventures may take you.


Brand Name:
Sea to Summit
Temp Rating:
25° F
Seasonal Usage:
Three Season
Temp Rating Celsius:
-4° C
Bag Style:
Fill Weight:
Regular: 11.6 oz / 330 g
Long: 13.1 oz / 370 g
ULTRA-DRY Down 750+ Loft; RDS-certified
Regular: 1 lb 14.3 oz / 860 g
Long: 2 lbs 0.8 oz / 930 g
Bag Length:
Regular: fits users up to 6 ft / 183 cm
Long: fits users up to 6 ft 4 in / 192 cm
Circumference at Chest:
Regular: 61 in / 155 cm
Long: 65 in / 164.5 cm
Circumference at Hips:
Regular: 57 in / 146 cm
Long: 61 in / 156 cm
Circumference at Foot:
Regular: 48 in / 122 cm
Long: 51 in / 129 cm
Bag Shell Material:
20D Nylon
Bag Stuff Size:
4.9L volume when compressed
Other Features:
• ULTRA-DRY Down 750+ Loft 90% Down Cluster Premium Duck Down certified Responsible Down Standard (RDS)
• Free-flow zipper system: full-length YKK® #5 main side zip, half-length opposite side zip, and foot zip provides unparalleled ventilation and allows use as a comforter
• Tapered rectangular shape for the perfect balance of space and adaptable warmth
• Super-light 20D Nylon shell and lining fabrics for minimal packed size and maximum breathability
• Vertical baffles over the chest to prevent down shifting as you roll over in your sleep
• Generously sized hood and dual cord adjustment for maximum heat retention
• Oversized neck draft tube with dual adjustment system
• Oversized zipper draft tube with anti-snag material
• Anatomically-shaped footbox retains warmth around your feet
• Internal pocket for phone / GPS / valuables
• Form a snug double sleeping bag by zipping to any Altitude™, Journey™ or Venture™ sleeping bag
• Includes lightweight Ultra-Sil™ compression bag and storage cell
More room between hips and knees to allow you to sleep in a natural position without compressing the down insulation and creating cold spots. Far more comfortable than narrow mummy bags for most sleepers.

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