The warmth retention mainly depends on the material and thickness. In terms of materials, acrylic fiber, cashmere, wool and porous polyester are all fibers with good warmth retention. Some consumers think that natural fibers are warmer. In fact, chemical fiber is also very warm, especially acrylic fiber, which is warmer than wool 15%.

In terms of thickness, leggings must have a certain thickness to ensure the absolute content of fiber to keep warm. Some goods will be marked with numbers such as 250, 500 and 800, and some will be marked with weight in grams; Some labels are the weight per square meter, and the unit is gram weight. Generally speaking, the larger the value, the thicker and warmer it is.

In addition, there are many kinds of native sheep down leggings on the market, such as pearl velvet, coral velvet, velvet and so on, which are dazzling. Zhu Hongliang said that there is no uniform standard for these native sheep down, so consumers don't have to worry about not knowing which one is warmer.

If the product inspection report is marked with the value of "heat preservation rate", the higher it is, the warmer it is; If it is not marked, the native sheep down has a certain length and fineness, feels fluffy and has better warmth retention.

Extended data:

The harm of wearing tight leggings for a long time;

1, aggravating dysmenorrhea and menstrual discomfort.

During menstruation, many girls will choose tight pants because it can reduce the risk of urine leakage, but in fact, too tight pants will cause pressure on the lower abdomen, affect blood circulation, and may also aggravate dysmenorrhea and menstrual discomfort. At the same time, tight pants rub the delicate perineum, which is easy to cause perineum congestion and edema. A closed environment can also breed bacteria and increase the chance of getting sick.

2, increase the risk of urethritis

Urethritis is a common disease in women, mainly because women have shorter urethra and are more susceptible to bacterial infection than men. Moreover, the female urethral orifice is close to the anus and may be invaded by Escherichia coli. Tights and pantyhose generally have short crotch and are worn close to female genitals, which provides opportunities for bacteria to stay there.

3, inguinal blackening

Wearing tights for a long time will lead to darker skin color in the groin. This is because the skin in the groin is delicate. If you wear tights for a long time, the fabric will rub excessively with the skin and form pigment precipitation, which will not only lead to dark skin color, but also cause dermatitis or folliculitis.

People's Daily Online-Women's Health Care: Women's love to wear tight pants is likely to bring 5 major hazards (Photos)

People's Network-How to choose the warmest leggings