Sea to Summit Ascent II Down Sleeping Bag

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Sea to Summit says:

Light, warm, comfortable and most importantly, adaptable. The Ascent™ is our sleeping bag of choice for most adventures, most of the time. Offering the perfect backpacking balance of comfort vs weight, our Ascent™ Series sleeping bags have more space than traditional mummy bags, yet still provide the thermal efficiency you need when exploring above the tree-line.

The 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 provides freedom of movement for both arms, additional ventilation and means the top third of the bag can be folded down as a mini quilt. The full length, two-way left side zip and separate foot zip transforms the bag into a full quilt for when the mercury climbs higher than expected.

If it’s warmth you’re after, close all the zips, pull the cord locks tight to drag everything in, and relax in luxurious comfort. The generous allocation of high quality 750+ Loft down ensures great insulation, while the oversized draft tubes prevents your body heat escaping. The panelled footbox and 3-dimensional hood make sure you’re not compressing the down when you’re trying to stay

warm. Vertical baffles over the chest section ensure the down insulation cannot migrate or shift to the outside of the bag during sleep, creating cold spots. A side block baffle construction maintains the 60/40 fill ratio, keeping more down on the top of the bag for maximum insulation.

We're working out what we think about Sea to Summit's Ascent II Down Sleeping Bag, we'll add our comments here in due course.

- Reviewed by Ultralight Outdoor Gear

Help and advice:

• Tapered rectangular shape for perfect balance of space and adaptable warmth
• Super-light 20D Nylon shell and lining fabrics for minimal packed size and maximum breathability
• RDS 750+ Loft ULTRA-DRY Down™ for superior insulating power
• Vertical chest baffles prevent down migration and cold spots
• Free-Flow half right side, full length two-way #5 YKK left side and separate foot zips for freedom of movement, increased ventilation and dual-use as a quilt
• Oversized draft tube with anti-snag materials, prevents heat loss through zipper
• Oversized neck draft tube with a dual adjustment system for even cinching and maximum warmth
• Generously sized hood and dual cord adjustment for maximum warmth retention
• Anatomically shaped footbox allows maximum down lofting, minimising heat loss from your feet
• Large internal security pocket
• Includes Ultra-Sil™ Compression Bag for compact storage
• Zip Coupling: This bag can be zipped to the Sea to Summit Women’s Altitude, Journey and Venture sleeping bags

Temperature Rating

• EN13537:2012 Comfort: -3°C / 27°F
• EN13537:2012 Comfort Limit: -9°C / 15°F
• EN13537:2012 Extreme: -28°C / -18°F

Regular Specs

• Weight: 1074g (excludes storage bags)
  
• Fill weight: 550g
  
• Fits up to: 6 ft / 183 cm
• Internal Width Shoulder: 155cm / 61 in
• Internal Width Waist: 146cm / 57 in
• Internal Width Feet: 122cm / 48 in

Materials

• Insulation: ULTRA-DRY Down® 750+ Loft, RDS 90/10 Premium Duck Down
• Shell: Lightweight 20D Nylon Shell
• Lining: 100% Nylon
• Zipper: Left-side #5 YKK zipper
• Comes with: Ultra-Sil™ compression bag and storage cell