Gear Guide: Down Sleeping bags from Sea to Summit

High-performance sleeping bags from one of the most innovative outdoor brands!

When Sea to Summit —one of the world's most innovative outdoor brands, first ventured into developing sleeping bags —one of the most nuanced and technical pieces of gear, expectations were high. The brand has carefully established a reputation for premium quality and construction, as well as high-level performance, with intuitive products that are ultralight, super packable and highly weather resistant. If they could capture the same levels of industry-leading quality and performance in their sleeping bag line, Sea to Summit would situate itself in an elite group.  Unsurprisingly, they have risen to the challenge, producing a full line of high-performance, premium, hydrophobic down sleeping bags that feature the same innovative design and construction that Sea to Summit has become known for. Ranging from lightweight summer bags to minimalist 3-season bags to Alpine expedition bags, the current line of Sea to Summit bags is impressive and comprehensive. Here at the Outdoor Gear Exchange/ GearX.com, we have recently received the full line of Sea to Summit sleeping bags. Read on to see what makes these sleeping bags so incredible and to find the right bag for your needs!

Technologies:

3D and 2D NanoShell Fabric Technologies-

3D NanoShell Technology features NanoShell; a highly breathable, 20 denier face fabric treated with a Nano DWR for water repellency, as well as 3D Barrier; a non-woven silicone vapor barrier layer. The NanoShell fabric protects the bag from external moisture, while the 3D barrier well as traps condensation that forms under the face fabric and prevents it from contacting the down layer beneath it. 3D NanoShell preserves the dry, lofty character of the down fill. This fabric is ideal for cold weather and expedition use. 2D Nanoshell features the same innovative, 20 denier NanoShell fabric for water repellency and breathability, but without the vapor barrier. This fabric is ideal for lightweight summer or 3-season bags, or for non-expedition cold weather sleeping. featured in the Micro and Talus bags.

2D PermaShell Fabric-

2D PermaShell fabric features a durable 33 denier face fabric that is highly water and wind resistant. This fabric is breathable, which allows moisture and condensation to escape, as well as down proof. Featured in the Trek series sleeping bags.

Pertex Quantum Fabric-

Pertex Quantum is an ultralight, yet surprisingly durable face fabric with a robust water repellency. At just 10 denier, Pertex Quantum is lightweight and packable, as well as highly breathable. Pertex Quantum is featured in the Spark sleeping bag.

ULTRA-DRY Down-

Sea to Summit's ULTRA-DRY Down is an incredibly resilient hydrophobic down fill that features a permanent (no loss of treatment effect after 14 washes) Nano-DWR treatment. ULTRA-DRY Down is extremely resistant to moisture, retaining loft and warmth significantly better than untreated down sleeping bags. This treatment allows the down fill in Sea to Summit sleeping bags retain 60% more loft and absorb 30% less moisture than untreated bags. Additionally, this treatment is antimicrobal and antibacterial, which decreases the need for frequent washing and extends the life of the bag.

Offset Baffles-

Offset baffles greatly minimize heat loss through the seams of the baffles, since those seams don't align directly. This is a simple way to increase the efficiency of Sea to Summit bags without a complex baffle system.

Side Block Baffles-

Side block baffles prevent down from shifting from the top of the bag to the bottom, which allows each sleeping bag to have a different ratio of down in the top and bottom sections of the sleeping bag. Down in the bottom of a sleeping bag is compressed during sleep, so it is less thermally efficient. Sea to Summit utilizes side block baffles in order to put more down in the top of their sleeping bags where it won't be compressed. Sea to Summit took into account the unique cuts of their bags when determining the proper ratio, therefore the Micro and Spark bags, which are tight-fitting and will move with the body, have a 55/45 top/bottom fill ratio, while the Alpine, Traverse, Talus and Trek bags have a 60/40 ratio since they will stay properly oriented in the night.

Zippers-

All Sea to Summit bags use high quality YKK zippers, which are durable and smooth. Stiff, 210 denier cloth in the draft tube prevents zipper snag and adds durability in this area of the bag. Additionally, the Alpine, Traverse, Talus and Trek bags all have heavy YKK #5 zippers that are the same length in all sizes, so any two models and sizes can be sipped together easily. The Micro and Traveller series bags have light YKK #3 zippers, so bags from each of these two models can zip to one another.

Sleeping Bag Series Overview:

 Alpine Series-

  The Alpine Series of expedition-level sleeping bags are the beefiest, warmest and most protective bags in the Sea to Summit line. Both the Ap II (-15C/5F) and the Ap III (-20C/-4F) feature 850+ ULTRA-DRY Down fill, which is lofty, thermally efficient, compressible, and hydrophobic. The Alpine series bags are designed with a Contoured Mummy shape to efficiently maximize both comfort and warmth, with an anatomically shaped footbox, a contoured shape to accommodate the shoulders and additional layers, as well as a form-fitting hood to trap heat around your face. Additionally, each Alpine series bag has 3D NanoShell fabric for durability, condensation management and water repellency; heavy YKK #5 zippers, an internal zippered pocket for electronics and a headlamp, offset baffles for efficiency and uniform down density, as well as side block baffles to keep the down in place and maintain a 60/40 fill ratio between the top and bottom of the bag. The alpine series bags are excellent for cold weather or high altitude expeditions. Shop the Sea to Summit Ap II (-15C/5F) and Ap III (-20C/-4F) Alpine Series sleeping bags    

Traverse Series-

  The Traverse Series of sleeping bags are Sea to Summit's most versatile sleeping bags. Featuring the same 850+ ULTRA-DRY Down fill, offset baffles, YKK #5 zippers and 3D NanoShell face fabric as the Alpine series, but with a Relaxed Mummy Convertible shape and a less extreme temperature range. The Relaxed Mummy Convertible shape has a larger hood, broader shoulders and chest sections, as well as an anatomically shaped footbox, for thermal efficiency with increased comfort. The traverse series bags can also be opened fully into a quilt for use in warmer temperatures or in huts. The Traverse series also feature side block baffles for a 60/40 down fill ratio. The Traverse Xt I (-7c/19F) and Xt II (-11C/12F) are perfect for backpacking, hiking, hut trips, and much more in spring, fall and winter weather. Shop the Sea to Summit Xt I (-7c/19F) and Xt II (-11C/12F) Traverse Series sleeping bags

Micro Series-

  The Micro Series of sleeping bags from Sea to Summit are ultra-light bags with unique design and innovative features. Featuring 2D NanoShell face fabric for lightweight, breathable weather resistance and superb packability, as well as 850+ ULTRA-DRY Down fill, the Micro Series bags are ultralight and ultra-compressible. The Micro Series bags have a Box Quilted Mummy Convertible shape, which utilizes quilted baffles or consistent down fill density throughout the body of the bag without shifting, as well as a form fit and a 55/45 top to bottom down fill ratio that keeps you warm as the bag rotates with your body in the night. The Most innovative feature of the Micro Series bags is the drawcord at the foot of each bag, which can be opened for temperature regulation, or so that you can unzip the entire bag and use it as a quilt. The Micro Series also uses a light YKK #3 zipper. The Mc II (2C/36F) and Mc III (-2C/28F) are great for ultralight backpacking and hiking, bike touring, travel, and alpine climbing. Shop the Sea to Summit Mc II (2C/36F) and Mc III (-2C/28F) Micro Series sleeping bags

Spark Series-

  The Spark Series bags are the highlight of the Sea to Summit line. Featuring an incredibly light, packable, minimalist design that still maintains warmth, the Spark Series has everything you need and nothing you don't. light, lofty 850+ ULTRA-DRY Down fill provides packability and warmth, while a featherlight 10 denier Pertex Quantum shell and 15 denier lining, as well as a 1/3 length lightweight YKK #3 zipper, bring the weight down to just 12.3 oz (Sp I, Reg).  Sewn-through baffles cut weight, 55/45 down fill ratio, a full hood, and a close-fitting mummy design maximize warmth. The Spark Series includes the ultralight 3-season Sp I (8C/46F), the Sp II (2C/35F) for colder weather activites, as well as the Sp III model (-4C/25F) for 3-season adventures and even some mild winter weather. This is a perfect bag for ultralight backpacking, thru-hiking, fast-and-light alpine climbing and mountaineering. Shop the Sea to Summit Sp I (8C/46F), Sp II (2C/35F) and Sp III (-4C/25F) Spark Series sleeping bags

Talus Series-

  The Talus Series of sleeping bags from Sea to Summit are classic, utility down mummy bags, available in three different warmth weights for a variety of outdoor activities. Each bag in the Talus Series utilizes 750+ ULTRA-DRY Down fill and lightweight, breathable 2D NanoShell face fabric for moisture resistance and durability. The Talus Series bags feature a Relaxed Mummy Shape, that is highly thermally efficient, yet very comfortable. The Talus Series back also use durable YKK #5 zippers, an internal storage pocket, offset baffles for effective down distribution, side block baffles to prevent shifting, as well as 60/40 top to bottom down fill ratios. the talus series is also offered in three different warmth weights: the Ts I (-5C/23F) for warm 3-season use, the Ts II (-10C/14F) for spring, fall and mild winter use, as well as the Ts III (-17C/1F) for colder weather and winter activities.  All three Talus bags are ideal for hiking, camping and backpacking, as well as winter camping and ski touring with the Ts III. Shop the Sea to Summit Ts I (-5C/23F),  Ts II (-10C/14F) and Ts III (-17C/1F) Talus Series sleeping bags  

Trek Series-

  The Trek Series of sleeping bags from Sea to Summit are a redesign of the classic rectangular sleeping bag, with some elements of a mummy. The result is a super comfortable sleeping bag that is still thermally efficient. A full length YKK #5 zipper allows the bag to be opened fully and used as a quilt in warmer weather or when indoors. The Trek Series also includes 650+ ULTRA-DRY Down fill and a 60/40 fill ratio held in place by side block baffles. The face fabric on the Trek Series is 2D PermaShell, which is highly durable and weather resistant, as well as a 40 denier lining for a comfortable feel inside of the bag. The Trek Series features three warmth weights: the summer focused 3-season Tk I (0C/32F), the Tk II (-8C/18F) for true 3-season fun, and the Tk III (-11C/12F) for spring, fall and mild winter weather. The Trek Series sleeping bags are great for backpacking, car camping, canoe camping, hiking and travel. Shop the Sea to Summit Tk I (0C/32F), Tk II (-8C/18F) and Tk III (-11C/12F) Trek Series sleeping bags    

Traveller Series-

The Traveller Series sleeping bags are lightweight, 750+ ULTRA-DRY Down fill bags with a focus on minimalism, warmth and versatility. Ideal for indoor use, summer camping and backpacking, or travel, the Traveller Series bags are perfect for trips where a form fitting, high tech bag is unnecessary. The Traveller Series feature a comfortable rectangular cut with a drawcord at the feet, as well as a full-length zipper that opens the bag up completely for use as a quilt. The Traveller sleeping bags use a YKK #3 zipper, which can zip to another Traveller or a Micro bag, which is great for couples. Shop the Sea to Summit Tr 1 (10C/50F) Traveller Series sleeping bag      

Shop All Sea to Summit Sleeping Bags Here!