Down is the down that grows in the belly of geese and ducks, and turns into reed-like fluff, which is called feather in sheet form. As down is an animal protein fiber, it has higher thermal insulation performance than cotton (plant cellulose). The spherical fiber of down is densely covered with millions of triangular micropores, which can contract and expand with the change of air temperature, thus generating the function of temperature regulation, absorbing the flowing hot air emitted by human body and isolating the invasion of cold air from the outside.
Wool, all fluff, seems to have been caught. Because the flocking methods are different and the materials used are different, the types of flocking are extremely rich, which is really difficult to generalize. In order to facilitate the selection and use, it is classified according to the different functions. Outdoor fleece can basically achieve the following functions: keeping warm, windproof, light weight, quick drying, wear resistance, elongation, easy compression, easy care, antistatic, splashing water and so on. Most outdoor fleece can achieve one or more functions, so if there are many subdivisions, it can be divided into two categories according to the main functions: one is to keep warm; The second is windproof. In fact, fleece is often a multi-functional combination, just for the convenience of reference and rough classification when choosing. No matter what kind of material is brushed, the thickness is still the main basis for determining the thermal insulation performance. In addition, the feeling of cold and warm is still different from person to person, and it cannot be generalized.