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  • Sea To Summit - Traverse XtII Sleeping Bag: 12 Degree Down -

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  • Sea To Summit - Traverse XtII Sleeping Bag: 12 Degree Down -

Sea To Summit Traverse XtII Sleeping Bag: 12 Degree Down

Temporarily Out Of Stock

Don't get too bummed. This item is on the way and will be available for purchase as soon as it rolls into the warehouse.

Can't wait? Consider one of the other 5 to 29 Degree Down Sleeping Bags we have in stock.

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3 Reviews


Drier than regular down with more room than a regular mummy bag.

The Sea To Summit Traverse Xtll 12 Degree Down Sleeping Bag doesn't mind wetness, humidity, or tent condensation. The active 3D NanoShell technology with Nano DWR particles repel condensation from the outside, and the bag's unique siliconized polyester barrier beneath the shell prevents condensed body moisture from soaking back into the down from the inside. And if wetness still gets through all that, the Ultra-Dry Down handles it better than regular down.

  • With an EN comfort rating of 23F and a lower limit of 12F, this bag is best suited for spring through fall nights in the mountains or winter nights in milder climates or sheltered yurts
  • 850+ Ultra-Dry Down insulation features 90% down cluster premium European goose down that offers superb warmth and comfort
  • Ultra-Dry Down features a permanent Nano-level water-repellent polymer treatment that repels moisture, helps inhibit bacterial and microbial growth, dries faster, retains loft longer, and prolongs the overall life of the sleeping bag (as compared to untreated down)
  • Relaxed mummy convertible shape has a larger hood, broader shoulders, and a larger chest area (compared to regular mummy bags), and the full-length side and foot zip allow you to convert this bag to a duvet
  • Differential cut shell means the lining at the torso is cut smaller than the outer shell fabric so the insulation can expand outward for better lofting and to reduce cold spots
  • 3D side walls and offset baffles lead to less heat loss while side block baffles prevent down from migrating from the top of the bag to the bottom
  • Anatomically tapered foot box offers a more relaxed fit and plenty of unrestricted room when you sleep
  • Anti-snag zip-draft tube and anti-snag neck draft tube with dual elastic adjustment seal in warmth and block out the cold
  • Two-way YKK #5 zippers with separate foot zip for convenience
  • Medium-sized internal zip pocket stashes your headlamp or book
  • Includes lightweight Ultra-Sil compression bag, mesh storage cell, and laundry bag
  • Item #STS0171

Tech Specs

3D NanoShell (20D polyester)
850+ fill down
Nano DWR treatment, 3D Barrier siliconized layer
relaxed mummy
Max User Height
[short] 5 ft 5 in, [regular] 6 ft, [long] 6 ft 7 in
Shoulder Circumference
[short] 59 in, [regular] 61 in, [long] 65 in
Hip Circumference
[short] 51 in, [regular] 53 in, [long] 56 in
Foot Circumference
[short] 38 in, [regular] 40 in, [long] 42 in
Draft Tube
Fill Weight
[short] 18 oz, [regular] 19 oz, [long] 20 oz
12 F
European Norm Comfort Rating
23 F
European Norm Lower Limit Rating
12 F
Storage Sack
Stuff Sack
yes, Ultra-Sil compression
Claimed Weight
[short] 2 lb 9 oz, [regular] 2 lb 11 oz, [long] 3 lb
Recommended Use
camping, backpacking
Manufacturer Warranty

Tech Specs

  • Reviews
  • Q & A

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Great Sleeping Bag

  • Familiarity: I've used it several times

I have used it several timer for sleeping in a tent in high altitude (3.900 to 4.500 m) and lower than cero celcius degrees. Slept very pleasently and warm. Very happy with the product. Features (opens up completely and also closes very well and inner pocket) are very good and so far the built quality seems to be superb.

Great all-around 3 season Bag

  • Familiarity: I've put it through the wringer

I have used this bag extensively over the last year. I used it for a traverse of the Uintah Highline trail last September and thoroughly loved it. Never once did the bag get wet despite 3 days of intensive rain, hail and wind; one day I spent almost 18 hours in and out of the bag when a thunderstorm series at 10,600 feet hit me with 8 different hailstorms from 11 am until after dark. The bag stayed dry the entire time despite the hail knocking condensation from inside the tent onto my sleeping bag. I was impressed with how toasty I was despite limited movement and therefor less heat from my body. I can't imagine a better bag for these fringe season conditions. The full length zipper (actually 2, one standard and another in the foot box) allows the user to push the bag well past most sacks upper limits by using it as a quilt or duvet. This sack provides a one quiver option from its EN-certified lower limit of 12F to temperatures around freezing. I look forward to taking this sleeping bag on my hybrid loop of the Sierra High Route and John Muir trail this september. You can find lighter bags out there but none with the features, diversity of application and reliability the Xt II will provide.

totally rad.

  • Familiarity: I've used it once or twice and have initial impressions

Picked this up at an REI garage sale a few weekends ago for almost half price, and im so glad i did. Im a bigger guy at about 5' 11" 200, and the fit is very nice. Its snug enough to keep me warm, but not restricting whatsoever. It packs down quite small, but not as small as some other down bags. It actually has a this layer of synthetic insulation on the outer part of the shell which is probably the reason for this, but all in all i wouldnt complain about its size. The zippered foot box is great, it allows me to vent and also walk around in the bag by sticking my feet out of the bottom...which has been extremely sweet since I use a hammock system and need to move in my bag quite a bit. The hood and zipper adjustments are very easy and have yet to snag or even come close.

Unfortunately, I havent had it long enough to use it in colder temps and comment on the temperature rating, but I dont have any doubts it will keep me warm down to the 20s if im on my pad.

All in all it really is a very awesome and well thought out bag that seems like it will last a very long time due to its quality construction. I would recommend to anyone.