Skip to content
Ascent Down Sleeping Bag (15°F & 30°F)
$469.00
Temp Rating
Size

# Ascent Down Sleeping Bag

$469.00
Technical warmth-retaining construction and high-lofting down, room to sleep comfortably, and unmatched ventilation.+ View tech specs

- Temp Rating
  15°F 15°F
  30°F 30°F
- Size
  Regular Regular
  Long Long

You can't add more of this product to the cart.
Highlights

BEST USE: Backpacking

PERFORMANCE: 3 Season

WEIGHT: 2lb 4oz | 1020g

COMPRESSED VOLUME: 7.5L

LOWER TEMP RATING: 15°F | -9°C

Description

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 ...

Read more

Product Details

Learn more

Ascent Down Sleeping Bag (15°F & 30°F)
$469.00

## Description

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

## 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-PFC
Non-PFC

Sea to Summit sleeping bags do not contain PFCs.

Ultra-Dry Down™ uses a non-PFC hydrophobic treatment to ensure it absorbs less moisture and dries more quickly. The treatment 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 RDS-certified responsibly sourced.

Down and synthetic-insulated sleeping bags utilize a non-PFC DWR treatment on the shell fabric for external moisture repellency. This helps prevent the insulation from becoming damp if the sleeping bag comes into contact with condensation on a tent wall, for instance.

## Tech specs

- Best Use
  Backpacking
- 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
--- | --- | --- | --- | ---

### Customize your comfort with precision

Unzip, unfold, and effortlessly tweak your airflow and sleeping positions as you adapt to changing temperatures and preferences

### Stay in sync with your surroundings

Seamlessly transition from a cocoon of warmth to an open vista of fresh air. Transform your sleeping bag to a quilt, two bags coupled together or back to a standard setup

### Move around the campsite with ease

With Free Flow, your sleeping bag becomes your trusted companion as you relax, wander about and bask in the great outdoors. It's more than a sleeping bag—it's an extension of your adventure

## 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

Shipping & Returns

Our warehouse is actively shipping orders from 8am to 1pm MST Monday through Friday. Most orders ship in one business day, but the transit time can take up to 7 days, depending on your distance from Boulder, Colorado.
2nd Day and Next Day Air orders will ship same day if placed by 1pm MST, Monday-Friday (except holidays).
All orders are eligible for fast and easy returns within 60 days of purchase.
For more details, please check out our Help Center

Blog

### Adventure Tips

Read article

## Adventure Enthusiasts' 7 Best Cities for Outdoor Activities in the US

Read article

## Best San Diego Hikes: Unforgettable Trails & Scenic Views

Read article

## New year, new wish list: National Parks Edition

View blog

## YOU MAY ALSO LIKE

Cart
$50.00 away from free shipping
Free Shipping
at $50.00
$100.00 away from free shipping
Free Shipping
at $100.00
Cart

You've qualified for free shipping

Cart

You've qualified for free shipping

Your cart is currently empty
To begin shopping, choose an option below.
New Gear
Dry Storage
Sleeping Pads, Bags & More
Camp Kitchen
Tents & Tarps
Notify Me When It’s Available
Ascent Down Sleeping Bag (15°F & 30°F)
Email Address
You're in! We'll let you know when it's back.
Choose your location
- United States
- Canada
- Australia
- China
- Austria
- Czechia
- France
- Germany
- Italy
- Spain
- United Kingdom
- India
Americas

We ship to the following countries

- Other Country in the Region

Asia Pacific

We ship to the following countries

- Other Country in the Region

Europe, Middle East & Africa

We ship to the following countries

- Other Country in the Region

Remove item

Are you sure?

No Yes, please
Remove free gift

Are you sure?

No Yes, please