Perspiration, support breasts and other functions.  Sleeping underwear: light and soft, suitable for wearing during sleep, which helps to relax the body.  By style:  No steel ring underwear: No steel ring support, more comfortable to wear, suitable for daily casual wear.  Gathering underwear: Through special design to make breasts more concentrated and straight, suitable for occasions where breast lines need to be shaped.  Adjustment underwear: Adjust the body shape through compression and passage to improve the body posture.  By material:  Cotton underwear: Good air permeability, strong moisture absorption, suitable for sensitive skin.  Chemical fiber underwear: Good elasticity, not easy to deform, but poor air permeability.  Lace underwear: Delicate appearance, suitable for matching with dress or evening dress.  II. Functions of Underwear  Support and Protection: Underwear can support breasts, prevent them from sagging or expanding, and protect breasts from outside harm.  Shaping and beautification: Through different designs, underwear can shape the ideal breast line, making the figure more plump or slender.  Comfort and breathability: High-quality underwear pays attention to the comfort and breathability of wearing, ensuring that it will not feel stuffy or uncomfortable when worn for a long time.  Health and Hygiene: Underwear, as close-fitting clothing, needs to be changed and cleaned regularly to maintain hygiene and health.  III. Precautions for choosing underwear  Size Proper: When choosing underwear, make sure that the size is appropriate, neither too tight nor too loose. Underwear that is too tight will compress the breasts and affect blood circulation; underwear that is too loose cannot play a role in support and protection.  Material comfort: choose materials with good air permeability and strong moisture absorption, and avoid wearing materials with poor air permeability such as chemical fiber.  Reasonable design: choose the appropriate underwear style according to your own needs, such as choosing gathering underwear when you need to shape the breast line, choosing steel-free underwear when you need comfort, etc.  Regular replacement: Underwear, as close-fitting clothing, needs to be changed regularly to maintain hygiene and health. It is recommended to change underwear every six months to one year.