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The Sea to Summit Ascent -9°C down mummy sleeping bag is a 3.5-season bag that offers unparalleled versatility, thanks to its advanced design and premium down insulation, making it ideal for various climates and outdoor activities. Whether you're embarking on a lengthy hike or a quick weekend trip, the ultra-lightweight 750+ RDS Certified duck down provides exceptional warmth in cold conditions, while the innovative triple-zip Free-Flow Zip system allows for excellent ventilation in warmer weather. Shaped to allow a natural sleeping position for comfort, while light and compact enough to go anywhere. You can also form a snug double sleeping bag by zipping to any women's sleeping bag from Sea to Summit.

Pair up your Sea to Summit sleeping bag with a compatible liner for the ultimate sleep system. Sleeping Bag Liners

More Help? For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags.

Features

• ULTRA-DRY Down 750+ Loft 90% Down Cluster Premium duck.
• Down certified Responsible Down Standard (RDS).
  
• Free-flow zip 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 zip draft tube keep the cold out and the warmth in.
  
• Internal pocket for phone / GPS / valuables.
  
• Includes lightweight Ultra-Sil compression bag and storage cell.
  
• Form a snug double sleeping bag by zipping to any women's sleeping bag from Sea to Summit.
• Comes with an Ultra-Sil compression bag and storage cell.
• QuiltLock: Every Sea to Summit sleeping back features the QuiltLock system that uses the snap locks located at the shoulder and foot end of Sea to Summit sleeping bags plus the quilt footbox / quilt straps to secure a quilt to the sleeping bag. This adds thermal performance and versatility to your sleep system: your integrated Sea to Summit quilt now works for ultralight summer adventures and turns your three-season bag into a four-season sleep system.

Specification 

• Maximum User Height:  Regular: 185cm /  - Long:  198cm
• Comfort Temperature: -2°C
• Comfort Temperature limit:  -9°C
• Shoulder width:  Regular: 158cm / Long: 168cm
• Waist With: Regular: 146cm / Long: 156cm
• Foot box width:  Regular: 119cm / Long: 129cm
• Insulated collar: Yes
• Shell Fabric: Recycled 20-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox.
• Filling: Ultra-Dry duck down
• Fill power: 750+
• Weight: Regular: 1020g / Long: 1157g
• Fill Weight: Regular: 540g / Long: 617g
• Compression Size: 8L
• Zip: Left