1. The shape of the sleeping bag
Because the shapes of sleeping bags are not complicated, there are almost only two kinds. One is mommy style and the other is envelope style.
The name MUMMY is a transliteration of the English word Mummy, which actually means Mummy. So many professional sleeping bags are called Mommy directly.
Envelope sleeping bags are almost only used for fleece sleeping bags or sleeping bags with simple styles, and the general size is 225*80CM. 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 room for free activities and 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 gives consideration to weight, volume and better insulation effect. Generally, there is an elastic head pocket above the shoulder to prevent heat from losing from the head. Some excellent brands have designed three-dimensional thickened shapes in the feet, which makes the feet better insulated and the space more comfortable.
Having said that, the choice of shape is relatively simple. If you only go camping in summer and autumn, you can choose an envelope sleeping bag.
If you plan to go to a cold place, it is recommended to choose a mummy style.
2. Filling materials for sleeping bags
Sleeping bags are classified by filling materials: down, cotton, wool and cotton under the upper feathers.
At present, cotton sleeping bags and down sleeping bags are more common.
Cotton sleeping bag:
There are many kinds of chemical fiber cotton. The most common glue-sprayed cotton ranges from four-hole cotton to seven-hole cotton.
Like all kinds of sleeping bags filled with chemical fiber, with the increase of use time, the thermal performance will gradually decline until it can not be used.
Down sleeping bag:
Lightweight, easy to compress, more comfortable, but expensive.
Down is divided into duck down and goose down, and the warmth retention of goose down is slightly higher than that of duck down under the same conditions.
Down has three main performance indicators:
1 index is the filling weight.
For example, 400g goose down sleeping bag and1100g duck down sleeping bag, this weight does not refer to the weight of sleeping bag, but refers to the net weight of down;
The second index is the cashmere content.
Down is composed of feather pieces and down. Feather pieces play an auxiliary role, and the warmth mainly comes from fine down.
The cashmere content is expressed as a percentage, for example, 80 cashmere content means that the cashmere content in 100 weight unit is 80 units.
Generally, the highest cashmere content of duck down is 85 to 90, and the highest cashmere content of goose down is 90 to 95.
The third index is the swelling degree of cashmere.
Filling force refers to the number of cubic inches of an ounce under a pressure of 68.4 grams. The higher the expansion degree of down, the better the warmth retention of down.
Generally, the swelling degree of domestic duck down is about 600, and that of domestic goose down is between 700 and 800.
The cashmere content of imported goose down can reach about 95, and the highest swelling degree can reach 900.
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 standards to determine the thermal insulation performance of down.
One is cashmere content.
That is, 80% or 85% on the label of sleeping bag indicates that the down content is 80% or 85%. The other 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.
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 that of duck down, which makes it better to keep warm. White is better than gray.
However, due to degreasing, south cashmere generally has no odor, 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 respect, it is not as good as a cotton sleeping bag.
3. Manufacturing technology of outdoor sleeping bag
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 brilliance.
With the development of technology, these processes have been mastered by most factories, and there is no difference.
Cotton sleeping bag, double-layer parallel staggered technology is widely used. The biggest advantage of this structure is that it will not let heat escape from the seam of the fixed cotton.
Down sleeping bags basically adopt trapezoidal vertical lining and invisible sewing technology. The biggest advantage of this process is that the down is isolated by an independent cavity to prevent the heat loss of other parts caused by the accumulation of down.
Invisible sewing thread can prevent down from drilling out due to sewing pinholes and water droplets from infiltrating.
In addition, anti-pinch strips are added on both sides of the zipper to prevent the zipper from biting the fabric and causing the fabric to be stuck or damaged. In order to prevent the heat loss of the zipper, a windshield is sewn on the edge of the zipper.
The neck is the place where the heat loss of sleeping bags is the most serious. Many brands are also very creative in this position.
For example, black ice sleeping bags, a semi-arc scarf is sewn on some series of sleeping bags to prevent the neck from getting cold when sleeping.
After reading the above brief introduction about the shape, material and technology of sleeping bags, I believe you have a basic understanding of sleeping bags. What you have to decide now is what environment to think about and when to buy a sleeping bag. Finally, I recommend a good sleeping bag for you. You can search Kakashi outdoors. His family sells black ice sleeping bags, which are very suitable for outdoor outings and the price is also suitable. I hope what I just said is helpful to you.