The steel ring of underwear is mainly used for shaping. The material is alloy and surrounds the breast half-circle. It supports and improves the shape and positioning of the breast. It can be removed, but it will affect the original effect of the bra.

Underwire bras are a common type of underwear on the market, commonly known as functional underwear. The internal steel rings are used to effectively gather and adjust the breasts. Wearing it for a long time can easily cause breast sagging and uneven breast size.

Most underwire bras use extremely soft steel rings, which reduce the feeling of restraint on the breasts and are basically pressure-free to wear; bras without steel rings gradually have the function of adjustment, allowing the breasts to move freely. In any case, it can still be comfortably shaped and gathered together.

Extended information:

The hazards are as follows:

1. From the perspective of traditional Chinese medicine, when women wear underwire bras, the underwire bra happens to be in the "liver meridian" of the human body. "Nearby, poor shoulder straps can cause the steel ring to shift and compress more than a dozen acupuncture points on the liver meridian, which can lead to poor circulation of the meridians.

2. Western medicine believes that it will block the flow of lymph downward, outward, and to the armpits, which can cause breast sclerosis, milk duct disease, etc. Improper tightness and uneven thickness of shoulder straps can cause shoulder pain. Wearing a bra poorly can also rub the nipples, causing itching, affecting nipple development and causing nipple inversion.

3. When the steel ring rubs and squeezes the breasts, it will cause skin redness, swelling and breast pain. If you wear a broken bra with steel rings protruding from the fabric, the skin will be scratched or even cut. A small number of women have skin allergies to nickel and other metals, and wearing bras with exposed underwires may cause contact dermatitis.

Reference: Baidu Encyclopedia-Underwear