1. Shape
The shape of the sleeping bag here includes the shape and personality design of the sleeping bag. Because the shape of sleeping bags is not complicated, there are almost only two kinds. One is mommy style and the other is envelope style. The name MUMMY is transliterated in English "Mummy", which actually means mummy. So many professional sleeping bags are directly called mummy. Of course, there are also some differences between the two, which actually belong to mommy-style variation.
envelope sleeping bags are almost only used in fleece sleeping bags or sleeping bags with simple styles, and the general size is 225*8CM. Suitable for high temperature seasons such as summer or early autumn. Because the shape of its shoulders and bottom can not effectively prevent the loss of body heat. But it also has a great advantage that it has free space for activities, which is suitable for friends who don't sleep well.
Mommy sleeping bag is almost a symbol of professional sleeping bag. This is a design that combines weight, volume and better insulation effect. Generally, there is an elastic head pocket above the shoulder to prevent heat loss from the head. Some excellent brands have designed a three-dimensional thickened shape at the foot, which makes the foot better insulated and the space more comfortable.
In appearance, there is not much difference between brands, so the design of individuality is their own performance. Color matching and printing are popular designs at present.
at this point, the choice of shape is relatively simple. If you just go camping in summer and autumn, or don't plan to travel long distances with it on your back, you can choose an envelope sleeping bag. If you plan to go to a colder place, I suggest you choose a mummy-style one.
2. Materials
Materials are the main reason for determining the price of sleeping bags. Fabric determines the durability and comfort of sleeping bags, while filler determines the thermal insulation performance of sleeping bags.
leisure travelers and go on road trip enthusiasts tend to pay more attention to comfort. I hope that sleeping outdoors can be as warm and comfortable as at home, and the requirements for weight and volume are not high. Therefore, most leisure sleeping bags are made of outer polyester and inner cotton, and some high-end brands even use softer and warmer materials such as flannel.
professional outdoor sports require more weight and volume. In particular, the trend of lightweight equipment deeply affects the design of many brands. The 31T and 34T high-density plaid fabrics previously used in high-grade down sleeping bags have appeared in some high-grade cotton sleeping bags. Excellent fabric with reasonable PU coating can well block moisture and prevent tearing, and the weight and fastness are effectively guaranteed. The fine 31T chunya spinning lining is incomparable in both hand feel and comfort.
3. Fillers
Fillers are generally divided into two types, one is fiber, which is what we call cotton sleeping bags. The other is down.
there are many kinds of fiber cotton, ranging from elastic cotton to 3-hole, 4-hole or even 7-hole cotton, as well as 3D cotton (Polarguard 3D produced by INVISTA) and silk-like cotton (Primaloft One). In terms of thermal insulation, 7 holes are better than 4 holes, and 4 holes are better than 3 holes. The principle is simple, that is, the more isolated air can be enclosed, the less heat exchange and the better thermal insulation performance.
later, based on the thermal insulation performance, DuPont and other companies invented 3D cotton which can be washed by machine and is more resistant to compression, Primaloft One which is not easy to absorb water, and Thermolite Quauo which can keep good thermal insulation performance even when it is wet. But no matter how much they are better than down, they are still not as good as down in terms of heat preservation.
There are many kinds of down, and the weight difference is also great. As long as you don't fool you with duck feathers, the thermal insulation performance is generally guaranteed. There are two main criteria to determine the thermal insulation performance of down. One is the down content, that is, 8% or 85% on the label of sleeping bag, which means that the down content is 8% or 85%. Another is bulkiness, which refers to the volume of a certain amount of down under constant weight pressure. It is the main factor that determines the warmth retention performance. So it is an important index of down quality.
Because down is filled in sleeping bags, and ordinary people can't detect it, there are some fake brands (even some regular brands) who don't pay attention to credibility to make a fuss about it. Mark some down with 75%-8% down content as 85% or even 9%, and mark the loose degree of less than 5 as 6, 7 or even 8, in order to win the favor of consumers. I'm afraid that feathers with a fluffy degree of more than 9/1,8 are only found in those birds in the Antarctic, but I don't know if they have taken them down horizontally. So for these indicators, I don't think we need to pursue them blindly. Choose some brands with excellent reputation, and 85/15,65 fluffy down is the main index at present. What can really achieve this index is a sleeping bag with good performance, which can basically adapt to the new requirements of keeping warm in most environments.
down index is important, but it is far less important than down filling quantity. This is easy to understand, and of course it is also a good place for many unscrupulous businesses to vote for you. The numbers on the labels are often inflated by 2% or more. To make you feel so cheap. There are some things you should know. Goose down is better than duck down. It's not that geese are more expensive than ducks, but that the down content of goose down is generally higher than duck down, and its warmth retention performance is better. White is better than gray. However, due to degreasing, south cashmere generally has no peculiar smell, while north cashmere often has some indecent smells and so on. Another is that the thermal insulation performance of down will be greatly reduced after it is damp. If it is wet, it will completely lose its thermal insulation performance. In this regard, it is not as good as cotton sleeping bags.
4. Technology
At present, there is little difference in the production technology of sleeping bags (I mean between regular brands), and the "exclusive patented technology" advertised by some brands can only show its once brilliant. With the development of technology, these processes have been mastered by most factories, and there is no difference.
cotton sleeping bags, double-layer parallel staggered technology is generally adopted. The biggest advantage of this structure is to prevent heat from being lost from the seams of fixed cotton, and to ensure that cotton is still evenly distributed and not broken after use and cleaning, thus ensuring excellent thermal insulation performance.
Down sleeping bags basically adopt trapezoidal vertical lining and invisible sewing technology. The biggest advantage of this machine is that the independent chamber isolates the down, preventing the down from piling up and causing heat loss in other parts. Invisible sewing thread can prevent down from drilling out and water droplets from seeping in due to sewing needle holes.
However, there are still many different details between different brands. These differences also play an important role in ensuring product quality. For example, the coating of fabrics, as we all know, the thermal insulation performance of down sleeping bags is very good, but once it is wet by moisture, the thermal insulation performance of down will suddenly decrease. In order to ensure the performance of down, a good coating is essential.
after reading the brief introduction about the shape, material and technology of sleeping bags, I believe that you have basically understood sleeping bags.
now, what you have to decide is to think about what environment and when you want to buy a sleeping bag.