$242.50 14% OFF
$299.50 14% OFF
$354.50 14% OFF
$469.50 14% OFF
$199.50 33% OFF
NEW ULTRA DRY DOWN!
With every Sea To Summit bag includes a "Down Batch Test Report" analysis certificate from the International Down Feather Laboratory (IDEL) to certify the superior loft of the down used in our Sea to Summit sleeping bags. You can be sure of the quality and fill within each bag.
The Traverse Xt1 is our most versatile premium Goose down sleeping bag, featuring all of our technical advancements in sleeping bag design such as 3D Nanoshell which actually provides a protective primaloft like layer between out shell and down protecting down from external moisture yet allowing great breathability.
Designed for a broad range of activities in a variety of environments, filled with 850+ Loft European Goose Down protected by the patent 3D NanoShell™.
Designed with a relaxed mummy shape, the Traverse series offers comfort in the widest range of temperatures. With the ability to be opened out into a full duvet when sleeping in huts and zippered up for winter camping in sub zero conditions the Traverse series can be used all year round. The oversized neck-collar and hood-seal, keep drafts out, minimizing heat loss around the face. The oversized zipper draft tube is fitted with the lightest and stiffest anti-snag material, for smooth operation. A security pocket located inside the bag is easily accessible, ideal for stowing electronics to preserve battery performance in extreme cold. Using a side block baffle construction to maintain a 60/40 fill ratio more down is located in the top of the bag for maximum insulation. The soft touch lining fabric is down proof by construction and highly breathable offering a comfortable sleep.
The Traverse series is our choice for trekking the Annapurna circuit in the Himalayas, ski touring hut to hut in the Alps and walking the Western Arthurs in Tasmania.
Relaxed Mummy Convertible
The Traverse relaxed mummy shape is cut with a larger hood, broader shoulders and large chest to provide a more comfortable sleeping bag while maintaining thermally efficiency. The addition of a full length side and foot zip allow for conversion from a traditional winter mummy shaped bag to a duvet offering the greatest versatility in a cold weather sleeping bag.
- Relaxed mummy convertible
- 3D NanoShellTM
- Differential cut shell with 3D side walls
- Offset baffles
- 60/40 fill ratio
- Side block baffle
- Anatomically tapered foot
- Zip draft tube with anti-snag
- Neck draft tube with dual elastic adjustment
- Cushioned internal hood drawcord with dual adjustment
- 2 way YKK #5 zips with separate foot zip
- Medium sized internal zip pocket
- Includes lightweight Ultra-Sil® compression bag, mesh storage cell and laundry bag
Down: 850+ Loft 95% European Goose NEW ULTRA DRY Down - LAB CERTIFIED
Fill weight: Short 380 g/13 oz | Regular 400 g/14 oz
Bag weight: Short 990 g/2 lb 3 oz | Regular 1070 g/2 lb 6 oz
Length/zip options: Short - right zip | Regular - left or right
Season ratings: Spring/Autumn/Winter-lite
Suggested use: Lightweight trekking, Hiking, Snow camping, Ski touring
Compression bag: Small - 10L to 3.3L
Size: Regular up to 183cm height, chest circumference 155cm, hip 136cm and foot 103cm
EN tested Temp rating: -25c extreme, lower limit -7c, Comfort -1c, (more on temp ratings in tech talk below)
Compression bag & packed size: approx Small 25 x 16cm
Fabrics – NanoShell™ Face
The NanoShell™ Face is used on both 2D NanoShell™ and 3D NanoShell™ systems. This face fabric is a high-density weave, 20 denier polyester ripstop with a Nano DWR finish. The Nano DWR is a surface treatment that makes the fabric extremely water repellent, without compromising breathability. Nano DWR is much more durable than standard DWR as it uses nano sized particles of water repellent to treat the fabric. These very small particles can attach to the fabric fibres in much greater quantity and adhere better, therefore lasting longer.
Fabrics – Lining 850+ Loft Series
The lining fabric of the 850+ series is a high-density weave, 20 denier polyester with a cire finish and soft touch hand feel. This material is breathable, light and incredibly durable for its weight
Anatomically Tapered Box Foot
The natural position your feet will take when lying flat is relaxed at ease and slightly stretched out. The anatomical cut box foot tapers in three directions. There is vertical taper from the toe to the heal creating a slant that matches the relaxed form of your feet. Along the outer edge of your foot there is a trapezoidal taper that provides a form fit, keeping down close to your extremities so they don’t get frostbite. From the top view, there is an outward taper from the ankles to the feet. This creates room for your toes to have great circulation and traps warmth in the foot box. This design exists in both the Alpine and Traverse bags.
All Sea to Summit sleeping bags use YKK zips. The Alpine, Traverse and Trek series use YKK #5 reverse zips, this allows you to un-zip the sleeping bag from top and bottom for temperature regulation.
Alpine, Traverse and Trek bags are fitted with a fixed zip length for all sizes. These bags can be zippered together in any combination of model and size. The Micro series use a lightweight YKK #3 zip. Micro’s can be zipped together with other Micro’s.
Anti-Snag Zip System
Neatly hidden in the draft tube is a super high-density 210D poly cloth. This fabric is exceptionally stiff and was originally engineered for use in high performance race sails. The lightweight, durable, stiff finish provides an excellent zipper anti-snag.
The Alpine and Traverse series use 3D compound differential cut patterning, this forms a shape that naturally traps warmth were it is most essential. The Micro and Trek series use a 2-Dimensional cut.
These hoods easily pull into a form fitted profile using the dual-adjustment drawcord.
Around the perimeter of the hood an internally constructed drawcord tunnel ensures the cord is buried deep within the down. When drawn closed the hood forms a comfortable seal around your face. A low profile Nifco dual cord adjuster is used for comfort and durability, offering a versatile fit. The hood closure uses a non-stretch cord for refined adjustment, while the neck collar uses an elastic cord to stretch with you as you move in the bag.
A large Security pocket is located inside the chest area, it can fit a passport and wallet or be used to stow your electronic devices. Anti-snag coupled with a YKK Invisible Zip ensures an ultra low profile for comfort against the skin.
Differential Cut Shell & Lining
Down insulates best when it is uncompressed and fully lofted. To help the down loft correctly, we use a differential cut shell and lining. The top shell of all Sea to Summit sleeping bags is cut larger than the lining. This creates space in between for the down to loft fully. In addition we use 3D side walls which gives the distinctive vertical sides to our sleeping bags, this further aids vertical loft along both sides of the bag. In the bottom of the bag, we use a reverse differential cut. By increasing the size of the lining relative to the shell, down lofts up to fill the voids around your body, torso, legs and the small of your back. Trapping heat close to the skin is essential for efficient warm sleeping.
Offset baffle construction provides a stable structure that allows the down to loft to the correct density and minimizes loss of heat through seams. This improves thermal efficiency of the sleeping bag without adding unnecessary weight of complicated baffle construction.
Side Block Baffle & Fill Ratio
The loft is optimised using a side block baffle construction which allows the bags to be filled with a different ratio of down in the top and bottom. We have put more down in the top of the bag where it is most effective as the down isn’t compressed by your body weight. The exact ratio of down fill must be matched to the shape of a sleeping bag. The Micro bags’ slim fit forms a tight cocoon around the body, when you toss and turn at night, the bag rotates with you. For this style of bag it is best to use a 55/45 (top/bottom) fill ratio. In the Trek, Traverse and Alpine bags a 60/40 fill ratio is more suitable. These bags are a generous cut and have room inside to rotate without the bag following.
In a world of technical brilliance it is remarkable that the performance of certain natural products have not been surpassed. Despite advancements in modern fibre technology, down is still the best insulator warmth for weight. Down forms the lightweight undercoating of birds, insulating them in very cold environments. The down we use is a by-product of the duck and goose meat industry. Like most natural products, down quality depends on many variables; predominantly the species, the feather content and the age. The best quality down is sourced from older birds, consisting of large plumes and clusters that create hundreds of thousands of tiny pockets, trapping body heat to provide unmatched insulation.
Not only does down have the best warmth to weight ratio, it is also the most durable sleeping bag insulation. If kept dry and occasionally washed using the recommended method, it will last a lifetime.
Loft is a measure of volume for a given weight of down. It is used to describe the quality of down, relating directly to the insulating performance. High loft down is warmer for a given weight than low loft down. Higher lofting down will fill a larger volume of space for a given weight, as a result, less down weight is required to fill each baffle in a sleeping bag. This translates to a lighter sleeping bag. The most common measure of loft is called Fill Power. 650 Fill Power implies that one ounce of this down will loft to fill a volume of 650 cubic inches. 850 Fill Power implies that one ounce of this down will loft to fill a volume of 850 cubic inches.
850+ Loft Goose Down
850+ Fill Power (Loft) Goose Down is the very best quality down available for sleeping bags. It provides the highest insulation for its weight and will last the longest. Sea to Summit 850+ Loft series bags are all filled with Eastern European Mother Goose 850+ loft down. We extensively test every batch of down to ensure the quality is consistently above 850 Loft. Eastern European Goose Down is well renowned for its high quality, achieving the best loft, with the largest clusters that are strong and resilient, lasting for years. All 850+ loft Sea to Summit sleeping bags are sold with an International Down Feather Laboratory (IDFL) certificate that identifies the exact Fill Power of the goose down used. We guarantee these bags are filled with goose down that exceeds 850 Fill Power in accordance to the International Down Feather Bureau (IDFB) standard.
EN13537 Temperature Rating System
EN13537 is a European standard for sleeping bag temperature ratings.
Everyone sleeps differently; some people are very warm sleepers while others feel the cold easily. There are many factors that affect your warmth and comfort in a sleeping bag. An important factor is that you use a good insulating mat, so your body heat isn’t drawn into the cold ground you are sleeping on. Other factors include your tent or shelter, gender and metabolism, clothing, sleeping bag liner, use of the hood and your daily calorie intake.
Although the EN13537 standard does not identify a single precise temperature a tested sleeping bag is suitable for, it does provide an industry standardised temperature range that a typical user can refer to as a guide for the conditions their bag will be most comfortable in.
The EN13537 standard provides three temperature levels to guide a consumer in their choice
Comfort - the temperature at which a standard woman can expect to sleep comfortably in a relaxed position. If you consider yourself a cold sleeper use this rating to decide the coldest temperature the sleeping bag is suitable for.
Lower Limit - the temperature at which a standard man can sleep for eight hours in a curled position without waking. If you consider yourself a warm sleeper you can use this rating to decide the coldest temperature the sleeping bag is suitable for.
Extreme - this is a survival only rating for a standard woman. Between the lower limit and the extreme rating a strong sensation of cold has to be expected and there is a risk of health damage due to hypothermia. This is an extreme survival rating only, we do not recommend you rely on this rating for general use.
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