Down sleeping bag
The down material can be divided into white goose down, white duck down, gray duck down, water bird down and so on.
The warmth per unit weight is the most effective. Feather sleeping bags are warmer, easy to squeeze, easy to maintain, and have a longer service life. The disadvantage is that they are expensive, absorb water, and wet sleeping bags have poor warmth. Unless it takes more than a day to dry completely, these characteristics are very doubtful for choosing feather sleeping bags in humid environments. The soft feathers are from the bottom outer feathers of adult and young birds. Most of the feathers used are domestic animals. The by-product is filled with exquisite elasticity. Generally, the basic elasticity is 550-fill, and the high-quality is 650or700-fill. It is the lightest weight, and its service life is three times longer than that of synthetic fiber.
Stitching method: There are three basic stitching methods for feather sleeping bags: one is sewthrough, the other is slanttube, and the third is overlappingtube. The first stitching method is simple and not complicated, but the heat energy is easily dissipated from the stitching line, and the second stitching method is most. Sleeping bag sewing method. This method can discharge the cold air out of the sleeping bag. The third is the most ideal method. This type of sleeping bag is more expensive. Most sleeping bags are designed with channelblocks, which can prevent feathers from moving around.