37 degree heating underwear

37-degree thermal underwear is a material that absorbs moisture and generates heat. This has a lot to do with the water absorption of the fiber molecules of the underwear. We should pay attention to the use of heat-absorbing underwear to avoid causing skin allergies. Heat-absorbing underwear is a fiber that absorbs water, generates heat, and then releases the heat. Under normal circumstances, it will not affect the health of the chest. It can also promote blood circulation in the chest and absorb sweat.

In fact, thermal underwear is not "high-tech". Because no matter what material it is, it can generate heat by absorbing moisture. The mechanism of fiber moisture absorption and heat generation is that when the fiber absorbs water, the hydrophilic groups in the fiber molecules combine with the water molecules, the kinetic energy of the water molecules decreases, and is converted into heat energy and released. Usually, the hygroscopic and heat-generating properties are closely related to the moisture regain of the fiber. The larger the moisture regain of the fiber, the better the hygroscopic and heat-generating properties are, while the smaller the moisture regain is, the worse the hygroscopic and heat-generating properties are. For example, wool and modal fibers have good hygroscopic and heat-generating effects, while ordinary acrylic and polyester fibers have poor hygroscopic and heat-generating effects.

The way far-infrared fibers generate heat is by first absorbing heat and then releasing it. There are two kinds of energy it absorbs: one is the energy in the environment, such as visible light, infrared, far infrared, etc. in sunlight; the other energy is the heat of the environment and the heat of the human body itself. After absorbing this energy, the far-infrared fiber will convert it into far-infrared rays and then radiate them to the human body, thereby providing heating to the human body. "Seram" is a kind of far-infrared radiating acrylic fiber, which is a material obtained by adding far-infrared radiating ceramic particles into acrylic fiber using advanced spinning technology.

Different from the heating principle of far-infrared fibers, phase change materials such as Outlast materials will undergo phase changes when the external ambient temperature changes, just like ice melts into water and water condenses into ice. When the external temperature rises, it will absorb heat just like ice melting into water; if the external temperature drops, it will solidify, which is equivalent to water condensing into ice again, so it will release heat again. So this is a two-way temperature regulating material. The conditions for phase change of materials are relatively stringent and the phase change range is relatively narrow. Phase change materials can only work within the corresponding temperature range, such as when they are cooled to a certain degree or heated to a certain degree.