Sea To Summit Ascent -9C Down Sleeping Bag

The Ascent down mummy sleeping bag redefines the meaning of versatile. 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, while light and compact enough to go anywhere.

Features

• PFC-free 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 use as a comforter
• Vertical baffles over the chest to prevent down shifting as you roll over in your sleep
• Shaped hood, oversized draft collar, and zipper draft tube keep the cold out and the warmth in
• Internal pocket for electronics and valuables
• Includes lightweight Ultra-Sil compression bag and storage cell
• Form a snug double sleeping bag by zipping to any Altitude, Journey or Venture sleeping bag

750+ LOFT ULTRA-DRY DOWN

• The second highest-lofting down used in any of Sea to Summit’s sleeping bags or quilts. 750+ Fill Power indicates that one ounce (30 g) of down will re-expand to over 750 cubic inches after compression. Higher loft means that less down can be used to achieve the same temperature rating – important for performance sleeping bags. The loft and down quality / composition are independently tested by the International Down and Feather Laboratory (IDFL) – a copy of the certification is supplied with every Sea to Summit sleeping bag. The down is responsibly sourced and RDS certified and treated with non-PFC Ultra-Dry Down treatment.

RESPONSIBLE DOWN STANDARD (RDS)

• 100 % of the down used in sleeping bags and quilts is independently certified to the Responsible Down Standard (RDS). The RDS certifies down against animal welfare requirements and tracks it from the source to the final product. The purchase of RDS certified products demonstrates demand for better animal welfare practices in the down and feather supply chain. Sea to Summit is certified to the RDS.

ZIP COUPLING

• Down and synthetic bags identified with zip coupling symbol use a 65 inch #5 YKK full-length zip which allows a unisex left-handed and women's specific right-handed bag to pair together. Designed to pair side by side, each person sleeps in their own bag enabling each of you to take advantage of your bag's unique insulation zones, hood and footbox features - perfect for cozy adventures for two. Bags with full-length #5 YKK zips on both sides can also be coupled together with other pairing bags.

FREE FLOW ZIP

• Free-Flow triple-zip design ensures your sleeping bag retains maximum warmth and efficiency when needed and multiple ventilation options when it's not. The half-zip on the right side of the bag (left side on women's bags) provides freedom of movement for both arms, additional ventilation and allows the top third of the bag to be folded down as a mini quilt when the mercury climbs higher than expected.

NON-PFC

• Sea to Summit sleeping bags do not contain PFCs.
• Ultra-Dry Down uses a non-PFC hydrophobic treatment to ensure it absorbs less moisture and dries more quickly. The treatment does not affect the breathability or the lifespan of the down and lasts through at least 20 washings.
• The down used in sleeping bags is RDS-certified responsibly sourced.
• Down and synthetic-insulated sleeping bags utilize a non-PFC DWR treatment on the shell fabric for external moisture repellency. This helps prevent the insulation from becoming damp if the sleeping bag comes into contact with condensation on a tent wall, for instance.

Tech features

• Best use: Backpacking
• Comes with: Ultra-Sil compression bag and storage cell
• Insulation: Ultra-Dry Down 750+ Loft
• Shape: Relaxed Mummy
• Shell fabric: Lightweight 20D Nylon Shell
• Zip options: Free-Flow zipper system