Wearing underwear has two main functions: to help the body support the chest, disperse the pressure on the shoulders and back, and prevent shoulder and back diseases. There is also a way to make the breasts look better, but there are also disadvantages. It inhibits lymphatic and blood circulation to a certain extent. It is recommended that if you have small breasts, you should not wear them while sleeping and let them relax. If you have large breasts, in order to prevent external expansion, it is recommended to choose steel-free. Underwear with wire rings can effectively reduce shaking and prevent external expansion. I wear Silofen underwear without wire rings, and I don’t feel restricted!