Our most versatile sleeping bag available, 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.

Features

RDS-certified, 750+ fillpower goose down with a non-PFC Ultra-Dry Down treatment to stay drier in damp conditions
Free-Flow Zip System offers excellent temperature regulation and multiple sleeping bag configurations
Thermally-efficient, more relaxed mummy fit, room in the hood to fit an Aeros pillow and the option to zip couple with a compatible Sea to Summit Women's bag to
deliver space for two comes standard
Lightweight 20D recycled nylon shell with a non-PFC DWR finish to protect against wind and moisture and a 20D recycled nylon liner for greater comfort
Box baffle construction throughout with vertical baffles in the torso to minimize down shift and maximize the retention of warmth
Sea to Summit Guarantee is offered for the Lifetime of this product

Tech specs

BEST USE: Backpacking
PERFORMANCE: 3 Season
COMES WITH: Ultra-Sil™ Compression Bag & Storage Cell
INSULATION: RDS certified, 750+ PFC free Ultra-Dry Down
SHAPE: Mummy
ZIP OPTIONS: Free-Flow zipper system

	15°F REGULAR	15°F LONG	30°F REGULAR	30°F LONG
BAG WEIGHT	2lbs 4oz	2lbs 8.8oz	1lb 11.6oz	1lb 15oz
COMPRESSED VOLUME	7.5 L	8.0 L	5.5 L	6.4 L
COMPRESSION SACK	13 L	13 L	8 L	8 L
FILL WEIGHT	19.0 oz	21.8 oz	10.6 oz	12.1 oz
FITS UP TO HEIGHT	6 ft 1 in	6 ft 6 in	6 ft 1 in	6 ft 6 in
TEMPERATURE RATING (EN LOWER LIMIT)	15°F	15°F	30°F	30°F
WOMEN'S TEMP RATING (EN COMFORT)	29°F	29°F	38°F	38°F

FAQ

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

Ascent Down Unisex Sleeping Bag

Q & A