A three-season bag rated to 15F (-9C) with 750+ fillpower Ultra-Dry goose down and the Free-Flow Zip system, which opens in multiple configurations for ventilation. Lays flat into a quilt for the warmest nights. Snap closures at the shoulders and a zip-open footbox add summer use modes. One of the more versatile bags Sea to Summit makes.
Sea to Summit
Ascent Down Sleeping Bag
Shipping
$399
1 retailer
At a glance6 specs
fill
Ultra-Dry goose down
season
3-season
features
Free-Flow Zip, Opens to quilt, Snap shoulders, Zip-open footbox
temp rating c
-9
temp rating f
15
fill power plus
750
Where to buy
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Description
Last reviewed May 16, 2026
Full specifications
6 fields
| fill | Ultra-Dry goose down |
|---|---|
| season | 3-season |
| features | Free-Flow Zip, Opens to quilt, Snap shoulders, Zip-open footbox |
| temp rating c | -9 |
| temp rating f | 15 |
| fill power plus | 750 |
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