Ascent Down Sleeping Bag (-1°C & -9°C)
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BEST USE: Backpacking
PERFORMANCE: 2.5 Season
WEIGHT: 782g
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Description
The Ascent down mummy sleeping bag redefines the meaning of versatile. Complex construction with technical features and high-quality down means it's suited to a multitude of climates and adventures. From long distance hikes to weekend getaways, the ultra lightweight 750+ RDS Certified goose down keeps you warm when it's cold outside, while the triple-zip 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.
Technical Features
The second highest-lofting down used in any of Sea to Summit’s sleeping bags or quilts. 750+ Fill Power indicates that one ounce (30g) 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 our non-PFC Ultra-Dry Down™ treatment.
Down and synthetic bags identified with our 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.
The polyester in the main body fabric contains 100% certified recycled content, independently certified to the Recycled Claim Standard (RCS). The RCS verifies recycled content and tracks it from the source to the final product. The purchase of RCS-certified products demonstrate demand for recycled content. Sea to Summit is certified to the RCS by Control Union License 1114661.
To learn more about RCS visit https://textileexchange.org/standards/recycled-claim-standard-global-recycled-standard/
Ultra-Dry Down is a non-PFC treatment hydrophobic treatment applied to the down during down processing. It is not a coating (which would reduce the ability of the down to loft), it comprises of very small particles of a polymer that cause the down clusters / feathers to repel water. Hydrophobic down is not waterproof; but it absorbs less water than untreated down and dries much more quickly.
Ultra-Dry Down does not affect the loft or lifespan of the down, or its breathability. The treatment will last through at least 20 washings.
100% of the down used in our 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. To learn more about RDS visit
The QuiltLock system 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 quilt now works for ultralight summer adventures and turns your three-season bag into a four-season sleep system.
Our 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.
Tech specs
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Best UseBackpacking
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Comes WithUltra-Sil compression bag and storage cell
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FabricRecycled 20-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox.
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InsulationUltra-Dry Down 750+ Loft Goose down
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ShapeRelaxed Mummy Fit: A more relaxed yet tapered mummy fit with high thermal performance.
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Zip OptionsFree-Flow zipper system
-1°C Regular | -1°C Long | -9°C Regular | -9°C Long |
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