Imagine a down gear construction technique that is based on pure geometry
leaving nothing to chance. Using the human form as a guide, fabric is formed into shapes that surround every part of your body, minimizing excess weight while keeping consistent levels of insulation at every point of your body. This is the foundation of Tubular Bell construction.
Starting with a cylindrical form that follows the human form perfectly, we cover that shape with a second, larger cylinder. This is where the Tubular Bells start to ring! Connect the smaller and larger cylinders with precisely cut baffles, or ribs, that follow the contour of the inner and outer cylinder. Now we have a construction technique that is miles/kilometers ahead of everyone else. We save weight by being precise, and we increase the temperature/weight ratio to unheard-of levels.
Why isn’t everyone doing this? Frankly, it is too labor intensive for most bag manufacturers. Valandré is the only specialist in the world willing to elevate down gear production to a technologically influenced art form. Down products that contain as many as 91 individually cut pieces deliver the ultimate fit – more insulation around the torso and foot box, and full insulation around the head and forehead. In short, nothing performs as well in terms of weight and packability as a Valandré product.
All our fabrics are sourced from Asahi-KASEI in OSAKA-JAPAN. In a typical japanese production organization, the Asahi-KASEI yarns are woven and dyed in independent factories, according to strict traditional japanese quality standarts. BANZAIIIII!
Asahi, is a japanese chemical giant, who is well known for their exclusive production in Japan of their polyamide 6.6 yarn. Never heard of Asahi? Forget your KODAK insta-matic, this is a NIKON.
As outside fabric on our goose down sleeping bags, we use an Asahi-KASEI impact 6.6 Nylon rip-stop (37g/m²). Nylon 6,6's have a longer molecular chain and a denser structure that qualifies it as a premium nylon fiber, and is roughly 20% stronger than a standard Nylon. It’s melting point is higher as well, making the fabric more resistant to heat and friction. The Nylon 6.6 yarns are difficult to dye, but once dyed it has superior colorfastness and is less susceptible to fading from sunlight and ozone and to yellowing from nitrous oxide. And all this, offers an fabric of excellent durability as well as a 20% higher tare strength, at a very low total weight. (wiki/Nylon_6-6)
This Polyamide (Nylon) fabric is calendared on the inside. The calendaring process, consist of placing the fabric under very high pressure, and connected to a very precise temperature heating on one side, the Nylon yarns is slightly melted. This process, once well done, offers a better protection against down leagues.
This fabric is then given a Durable Water-Repellency finish on the outside. Asahi-KASEI have selected a chemical product developed and produced in Japan, from a company named: HIRAMATSU SANGYO CO.,LTD HIRAMATSU is small, but it is the greatest textile Printing, Dyeing & Finishing factory in the world, especially for POLYESTER and NYLON fabrics.
A Durable Water-Repellency reacts like a “Teflon frying pan”, which systematically rejects water and humidity. But certain factors can eventually worsen the water repellent property like: stains, rubbing, washing and dry cleaning. HIRAMATSU have recently developed a DWR treatment called BONNET.
To understand the problematic in a DWR treatment it is necessary to keep in mind, that the treatment should have only little influence on the softness of the hand feel, but the very nature of a DWR treatment tend to make a fabric hard and stiff. Hence the problematic is to achieve the optimal balancing point, especially to words the durability aspect.
The durability factor is calculated and expressed in 5-CLASS levels. New, HIRAMATSU’s BONNET DWR has naturally a CLASS-5 level, but after 100 washes it still rates a CLASS-3 level. And this is an exceptional durability.
All together, Here at Valandre we have not seen anything better than the Asahi-KASEI Impact 6.6
Valandre does not use a laminated membrane fabric. Why would we want to ad bulk, weight and a hundred bucks to the price of a sleeping bag for a solution that is infective in cold weather, and can be dangerous in some situations, and then let you pay for it?
As the temperature lowers, the air holds less humidity. So in low temperatures, be it 20.000ft or 15 miles in, you are in a very dry condition. So no there is no need for a waterproof membrane.
Waterproof membranes are designed to be used in warmer temperatures, not in freezing conditions where our products are meant to perform.
So, take a water molecule, and try to let it pass through a frozen membrane. That molecule will instantly freeze once it comes in contact with the membrane, and this will eliminate the breathability, and turn the waterproof membrane fabric into a sort of plastic bag by sealing up all the pores.
As water is turned into a solid mass of frozen ice, the volume of the mass expands. This is the case of a molecule of humidity, that freezes in the pores, and by expansion blocks the breathability. It's the same effect, that can create a delamination of the fabric (Ice expansion between membrane and fabric).
The elements of a correctly set up camp site greatly improve your comfort and safety, with a well ventilated tent, pitched correctly and a sleeping bag that is kept as dry as possible. In a cold environment, this is the only way to roll. Welcome to the core.
We do not advise overfilling down. Down is not warm by itself. What insulates is the exceptional capacity of down to trap body heat. In our products, we are using a certain density, which is the relation between compartment volume and injected quantity. Overfilling changes this balancing point, and creates compression. And compressed down will not trap more body heat.