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Explore Down Sleeping Bag (25°F & 5°F)


4.7 star rating 3 Reviews

$369.00 – $649.00

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.


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Ideal for adventures where you return to the same campsite each evening, the Explore™ down sleeping bag brings spacious luxury and incredibly versatile ventilation options to wherever your travels may take you. Each side of the Explore has a full-length side zipper; a third zipper can be found in the foot box zipper.

High-lofting down and quality construction keep you cozy when it’s cold, and the zippers provide temperature regulation up to the point where you remove the upper section and sleep under it as a quilt.

The only thing which might be cozier would be a double version – and we have that, too.

Is this down sleeping bag…?

  • Warm enough for cool weather camping or travel? Yes. The quality down and technical construction keep you warm even on chilly nights, for example, the Explore 5°F – paired with a high R-Value sleeping mat, like the Comfort Plus Insulated, this will take most campers through all four seasons.

  • Suitable for summer temperatures? Yes. The full-length side zippers and foot box zipper can be opened for ventilation or to remove the upper section completely for use as a comforter in really warm weather.

  • Fitted with a sleeve to slide in a sleeping mat? No – it is fitted with something better! The lower part of the Explore is fully insulated to avoid cold spots – elasticated straps on the underside attach to a sleeping pad of your choice to form a roomy, cozy sleep system.

Learn more about down quality, fill power, water repellency, and responsible sourcing HERE 


Best Use

  • Car Camping


  • 2.5 Season: 25°F (comfort range 25°F to 65°F)
  • 3.5 Season: 5°F (comfort range 5°F to 60°F)


  • A generous shape to allow you to sleep in any position without compressing the down insulation and creating cold spots.


  • Elasticated straps to attach to a sleeping pad of your choice


  • ULTRA-DRY Down 750+ Loft 90% Down Cluster Premium Duck Down certified Responsible Down Standard (RDS)
  • Vertical baffles over the chest to prevent down shift as you roll over in your sleep.
  • Full-length YKK® #5 main side zips and foot box zip provide unmatched ventilation and allow the top section to be removed and used as a comforter.
  • Shaped hood and zipper draft tubes keep cold out and warmth in.
  • Form a snug sleeping bag for two by zipping to another Explore or Ascent™, Trek™, Traverse™, Altitude™, Journey™ or Venture™ sleeping bag.
  • Includes lightweight Ultra-Sil™ compression bag.

Technical Features

750+ Loft Ultra-Dry Down™

The second highest-lofting down used in any of Sea to Summit’s sleeping bags. 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 the environmentally-friendly Ultra-Dry Down™ treatment.


All of which means you can rest easy.

Responsible Down Standard (RDS)

All Sea to Summit sleeping bags use only down which is certified according to the Responsible Down Standard. The RDS is helping shift the entire down and feather industry towards more humane animal rearing and handling practices. Overseen by the industry leading Textile Exchange, the RDS requires independent, third-party assessments of all aspects of animal rearing and handling throughout the entire supply chain. By using only down that meets the audited requirements of the RDS, we can have confidence that each phase of the collection process has been completed with the welfare and ethical treatment of waterfowl in mind.

To learn more about RDS, visit

Zip Coupling

Down and synthetic bags identified with our zip coupling symbol use a 65 inch #5 YKK full-length zip which allows a unisex left-handed and women's specific right-handed bag to pair together.

Designed to pair side by side, each person sleeps in their own bag enabling each of you to take advantage of your bag's unique insulation zones, hood and footbox features - perfect for cozy adventures for two.

Bags with full-length #5 YKK zips on both sides can also be coupled together with other pairing bags.

Tech Specs

Product Details

Best Use
Car Camping
Comes With
Ultra-Sil Compression Sack
Ultra-Dry Down 750+ Loft
Shell Fabric
30D Nylon shell
Zip Options
Full length left side, right side and foot box zipper. This provides more options than we have room to list.
explore-down-sleeping-bag-25-f-5-f-regular.svg explore-down-sleeping-bag-25-f-5-f-long.svg explore-down-sleeping-bag-25-f-5-f-double.svg
Explore 2
2lbs 6.6oz / 1095g
6.3 L
S - 10L to 3.3L
15.9oz / 450g
6 ft / 183 cm
2.5 Season
25°F (Lower Limit)
37°F (Comfort Limit)
Explore 2
2lbs 10.5oz / 1205g
8 L
S - 10L to 3.3L
18.3oz / 520g
6 ft 4 in / 192 cm
2.5 Season
25°F (Lower Limit)
37°F (Comfort Limit)
Explore 3
3lbs 1.2oz / 1395g
10.4 L
M - 14L to 4.5L
26.5oz / 750g
6 ft / 183 cm
3.5 Season
5°F (Lower Limit)
21°F (Comfort Limit)
Explore 3
3lbs 8.3oz / 1595g
12.3 L
M - 14L to 4.5L
30.3oz / 860g
6 ft 4 in / 192 cm
3.5 Season
5°F (Lower Limit)
21°F (Comfort Limit)
Explore 3
3lbs 14.8oz / 1780g
14 L
L - 20L to 6.5L
35.3oz / 1000g
6 ft / 183 cm
3.5 Season
5°F (Lower Limit)
21°F (Comfort Limit)
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