Highlights
BEST USE: Backpacking
PERFORMANCE: 3 Season
WEIGHT: 1lb 11.6oz | 782g
COMPRESSED VOLUME: 5.5L
LOWER TEMP RATING: 30°F | -1°C
Description
Our most versatile sleeping bag. In colder temperatures you can cinch down the technical hood, zip up the draft-tube protected zippers and allow the 750+ Ultra-Dry Goose Down to keep you warm. In warmer conditions...
Product Details
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Sleeping Bag ISO Temperature Ratings Explained
Sea to Summit tests its sleeping bags for their temperature rating using the ISO 23537 test protocol. This test gives two key ratings: Lower Limit and Comfort Rating.
Lower Limit: The lowest temperature at which a man should stay warm.
Comfort Rating: The lowest temperature at which a woman should stay warm.
Sea to Summit Women’s-specific sleeping bags are listed using the Comfort Rating. Unisex bags are listed using the Lower Rating. For example, if the bag is rated at Lower Limit of 14°F | -10°C and Comfort rating of 27°F | -3°C, it should keep a woman warm down to 27°F | -3°C and a man warm down to 14°F | -10°C, if they are wearing warm clothes and using a good sleeping pad.
Remember: These ratings are just guidelines. Movement, weather, and your gear setup can all affect how warm you actually stay.
Pro Tip: Think of your sleeping bag, pad, and liner as a system. If you expect 28°F | -2°C weather, choose a sleeping bag rated for 23°F | -5°C, use a sleeping pad with an R-Value of 3 or more, and add a liner for extra warmth.
Ascent Down Sleeping Bag (15°F & 30°F)
$429.00
Description
Our most versatile sleeping bag. In colder temperatures you can cinch down the technical hood, zip up the draft-tube protected zippers and allow the 750+ Ultra-Dry Goose Down to keep you warm. In warmer conditions, the Free-Flow Zip system lets you unzip in different configurations for superior ventilation and even open up flat to turn the Ascent sleeping bag into a quilt on the warmest of nights.
All of the above make the Ascent a true three-season backcountry bag, one of very few on the market. Close the snaps at the shoulders, open the footbox zipper and wear the Ascent at camp - hardcore adventures don't have to be hard all the time.
Design Details
Technical Features
750+ LOFT ULTRA-DRY DOWN
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 (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.
FREE FLOW ZIP
FREE FLOW ZIP
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.
RESPONSIBLE DOWN STANDARD (RDS)
RESPONSIBLE DOWN STANDARD (RDS)
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 https://textileexchange.org/standards/responsible-down/
Non-PFAS
Non-PFAS
Sea to Summit sleeping bag fabrics and insulation are made without PFAS compounds. The non-PFAS DWR finish on the shell helps prevent the insulation from becoming damp if the bag comes into contact with mositure, such as tent wall condensation.
Ultra-Dry Down is a non-PFAS hydrophobic treatment that absorbs less moisture and dries more quickly. It does not affect the 'breathability' or the lifespan of the down and lasts through at least 20 washings. The down used in our sleeping bags is responsibly sourced.
Sea to Summit Dry Bags, Stuff Sacks and Compression Bags use a non-PFAS Durable Water Repellent finish to help shed water. Big River bags use a non-PFAS PU coating.
Tech specs
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Best UseBackpacking
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Comes With40D recycled, bluesign APPROVED nylon compression bag
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InsulationRDS certified, 750+ non-PFAS Ultra-Dry Down
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ShapeRelaxed mummy
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Zip OptionsFree-Flow zipper system
| 30°F Regular | 30°F Long | 15°F Regular | 15°F Long |
|---|
Excellent insulation and warmth
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Frequently Asked questions
Is the Ascent suitable for colder weather?
Yes - the -9°C/15°F version has high-lofting down, a technical hood and draft tubes that make it great for extended three-season use.
Is the Ascent comfortable in warmer weather?
Yes! The Free-Flow zippers can be opened sequentially for ventilation or to open the bag completely flat as a quilt.
Can the Ascent be zipped to another sleeping bag?
Yes - the Unisex Ascent can be coupled with a Women's Ascent, or zipped together with most STS Women's sleeping bags
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