Cold type in winter. Is it true that the ultra-thin thermal underwear with 37 degrees constant temperature in winter?

Thermostatic underwear is a gimmick. Thermostatic underwear generally advocates the use of "self-heating" materials. CCTV's "Is it true" column once did an experiment of "self-heating" underwear. The column group bought five kinds of "self-heating" underwear by sampling, and wrapped the thermometer tightly in these five kinds of thermal underwear under the condition of ensuring the constant temperature of the laboratory at 23 degrees Celsius. The experiment found that none of these five kinds of underwear can give off heat.

Velvet underwear and cotton underwear are both kept warm by thickness. The thicker the material, the better the warmth retention effect. The so-called "self-heating" underwear, the fabric is actually chemical acrylic fiber, and its thermal principle is to use the heat released by the human body to return to the human body, rather than heating itself. The so-called latest technology of merchants is just a gimmick.

Extended data:

These "functional underwear" are not reliable:

1, antibacterial underwear: it is not easy to breed bacteria. The antibacterial function is only that the moisture regain of the material is relatively low and it is not easy to breed bacteria. In the actual work and spot check, there are few fiber materials with antibacterial function. When buying antibacterial clothing, you can ask the merchant to show the antibacterial performance test report.

2, adjustable underwear: can only give you a good figure for the time being. Adjustable underwear is underwear that plays a traction or constraint role on specific parts of the human body to maintain or adjust the shape of specific parts of the human body. You can only temporarily change your body shape to make people look better. Once you take off your underwear, you will soon return to your original shape.

3, skin care underwear: whitening and moisturizing is not credible. Milk protein, amino acids and vitamins can really keep skin elastic, but technically speaking, the possibility of fabric fiber containing milk protein, amino acids and vitamins is extremely small, so the statement that it can whiten and moisturize is not credible. The quality of skin is closely related to internal factors such as diet, work and rest, and heredity. And thermal underwear can't change the internal cause.

References:

People's Network-Consumer Reminder: "Self-heating" underwear is accused of being more expensive than ordinary gimmicks.

People's Daily Online-Revealing the Secret of Heating Underwear: There is little difference between spontaneous heat and ordinary underwear.