Sea To Summit Ascent AcI 25ºF Ultra-Dry Down Sleeping Bag

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.

• Tapered rectangular sleeping bag – allows more natural sleeping position without compressing down insulation and creating cold spots
• Ultra-Dry Down® 750+ loft 90% down cluster premium duck down
• Down certified to the Responsible Down Standard (RDS)
• Free-Flow Zip design ensures maximum warmth and efficiency when needed; multiple ventilation options when not
• Full-length left side YKK® #5 main side zip, half-length opposite side zip and foot zip provide unparalleled ventilation and use as comforter
• Zip to any Altitude™, Journey™ or Venture™ sleeping bag to form snug double sleeping bag
• Vertical baffles over chest to prevent down shifting as you roll over in your sleep
• Shaped hood, oversized draft collar and zipper draft tub seal in warmth and keep cold out
• Internal pocket for phone, GPS or other valuables
• Lightweight Ultra-Sil™ compression bag and storage cell included
• Manufacturer’s lifetime guarantee
• Shell material: 20D nylon
• Fits up to: 6′ 0″ (regular), 6′ 4″ (long)
• Temperature (EN rating): Comfort range 25ºF to 70ºF 
• Women’s temperature (EN rating): 35º comfort
• Compressed volume: 4.9 liters (regular)
• Compression sack: 10 to 3.3 liters 
• Fill weight: 11.66 oz. (regular); 13.1 oz. (long)
• Suggested use: Backpacking