The warmth retention of clothes is related to the thickness of air layer in clothes. When the thickness exceeds 15mm, the air convection in the clothes increases, but the warmth retention decreases.

If you wear too much and too thick, the blood vessels in the skin will expand due to heat, increase heat dissipation, reduce the body's ability to adapt to temperature changes, and people will become more afraid of cold.

Winter dress code

1, choose warm and comfortable clothes.

There should be a certain number of clothes and suitable thickness in winter. Down jacket has a certain thickness, and the pores of wool fabric are not straight through, which can bring people a suitable clothing microclimate. Leather clothing can almost block the air convection in clothes, and wear leather clothing to keep warm when going out in winter.

Step 2 dress according to room temperature control

In winter, the indoor temperature should not be too high, and the temperature difference between indoor and outdoor is too large, which makes it difficult for the human body to adapt and easily induces diseases such as colds. According to experts' research, there is a comfortable air temperature range. If the air temperature is too high, it will not only cause physical discomfort, easily lead to diseases, but also affect higher nervous activity's autonomic nervous function, resulting in people's inattention, poor accuracy and coordination, and reduced reaction speed.

3, dress avoid collar is too high and too tight

Too tight collar will compress the blood vessels in the neck, reduce the nutrients delivered to the brain and eyes, and then affect the vision, and also affect the normal activities of the cervical spine, which may easily lead to cervical spondylosis.

Some people who wear high-necked clothes turn their heads too fast, which will induce bradycardia, even cardiac arrest and hypotension, leading to reduced blood flow in the brain and temporary interruption. In severe cases, syncope, pallor and unconsciousness may occur.