The Trek down sleeping bag brings the comfort of a tapered-rectangular mummy shape and the versatility of a dual-zip ventilation system to wherever your travels may take you. The full-length side zipper and secondary foot box zipper allow you to increase ventilation or open the Trek completely flat like a comforter, and the quality down will keep you warm and snug on chilly nights.

• The broader mummy cut gives you room to move inside the bag, regardless of your sleeping position. A Regular Wide model is available for those who really appreciate the extra wiggle room.
• Light and compact, the Trek might just become your favorite trekking / backpacking / travel / camping / down sleeping bag

Features

• PFC-free ULTRA-DRY Down 650+ Loft 85 % Down Cluster Premium Duck Down certified Responsible Down Standard (RDS)
• Full-length YKK #5 main side zip and foot box zip provide superior ventilation and allow the bag to be used as a comforter
• Shaped hood and oversized zipper draft tubes (Trek 10°F also has a draft collar, fits snugly around shoulders) to seal in warmth and keep cold out
• 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

650+ LOFT ULTRA-DRY DOWN

• The second highest-lofting down used in any of Sea to Summit’s sleeping bags or quilts. 650+ Fill Power indicates that one ounce (30 g) of down will re-expand to over 650 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.

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: All outdoor activities
• Comes with: Ultra-Sil Compression Sack and Storage Cube
• Insulation: Ultra-Dry Down 650+ Loft
• Shape: Relaxed Mummy
• Shell fabric: 30D Nylon Shell
• Zip options: Full length left side and foot box zipper. Unzip fully to use as quilt or comforter.