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Tapered rectangular shape: plenty of room for side sleepers
Draft tubes on all zips help seal in warmth
Free Flow zips: open for ventilation
Free-Flow zips: open for unrestricted arm movement
Anatomical footbox prevents cold spots
Free Flow zips: open and ‘wear’ your Trek outside the tent
Free Flow zips: open to cool your feet
360° draught collar on the 0°F / -18°C bag
Free Flow zips: open completely flat as a quilt
Couples with a Women’s Trek or Ascent of any size
Tapered rectangular shape: plenty of room for side sleepers
Draft tubes on all zips help seal in warmth
Free Flow zips: open for ventilation
Free-Flow zips: open for unrestricted arm movement
Anatomical footbox prevents cold spots
Free Flow zips: open and ‘wear’ your Trek outside the tent
Free Flow zips: open to cool your feet
360° draught collar on the 0°F / -18°C bag
Free Flow zips: open completely flat as a quilt
Couples with a Women’s Trek or Ascent of any size
Highlights
BEST USE: Camping, Overlanding, Van Life
PERFORMANCE: 2 Season
WEIGHT: 2lb 7.5oz | 1119g
COMPRESSED VOLUME: 8.2L
LOWER TEMP RATING: 30°F | -1°C
Description
If you've ever wished for a less-constrictive sleeping bag that keeps you comfortable in a variety of cool-to-warm conditions, the Trek may become your go-to bag. The Free-Flow Zip system allows you to open the bag sequentially for ventilation up to the point where it is ...
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.
Trek Down Sleeping Bag (0°F - 30°F)
$349.00
Description
If you've ever wished for a less-constrictive sleeping bag that keeps you comfortable in a variety of cool-to-warm conditions, the Trek may become your go-to bag.
The Free-Flow Zip system allows you to open the bag sequentially for ventilation up to the point where it is opened flat as a quilt - you can even secure the snaps around your shoulders, open the footbox zipper and 'wear' the Trek around camp.
650+ fillpower duck down with a non-PFAS Ultra-Dry Down treatment keep you insulated in damper conditions. Slip an Aeros Pillow into the hood and enjoy a great night's sleep - wherever your travels take you.
Design Details
Technical Features
650+ LOFT ULTRA-DRY DOWN
650+ LOFT ULTRA-DRY DOWN
650+ Fill Power indicates that one ounce (30g) of down will re-expand to over 650 cubic inches after compression.
The higher the Fill Power, the more the down will insulate for a given weight. This means that less down can be used to achieve the same temperature rating. 650+ goose down provides a good level of insulation for camping and travel use.
Every Sea to Summit down sleeping bag comes with a test report from the International Down and Feather Laboratory IDFL confirming the down loft and quality. All of our down is RDS certified responsibly sourced, and hydrophobically treated with a non-PFAS Ultra-Dry Down finish.
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 UseCamping, Overlanding, Van Life
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Comes With40D recycled, bluesign APPROVED nylon compression bag
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InsulationRDS certified, 650+ non-PFAS Ultra-Dry Down
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ShapeTapered rectangular
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Zip OptionsFree-Flow zipper system
| 30°F Regular | 30°F Long | 15°F Regular | 15°F Long | 0°F Regular | 0°F Long |
|---|
Versatility for any adventure
Frequently Asked questions
What are the differences between the Trek and the Ascent?
The Trek has a broader cut and is intended for travel/camping/some backpacking. The Ascent is a more technical bag for ambitious backcountry use.
Can Treks be zipped together?
Yes - the unisex and Women's Trek can be coupled (Unisex Trek will zip to most STS Women's bags)
Is the Trek suitable for warmer weather?
Yes! The Free-Flow zipper system provides unparalleled ventilation and allows the bag to be opened flat as a quilt
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