It helps reduce back strain with the belt's four powers: tourmaline, far-infrared rays, 20 magnets, and self-heating from body temperature. You should feel warmth around the area where the belt is worn. It is also effective for coldness in the abdomen, which is common for women, such as during menstruation. It is recommended to wear it over an inner layer or with a towel placed underneath. The belt section is made of highly elastic mesh for breathability, reducing stuffiness caused by summer heat. When washing, rinse lightly with water and dry. It can be used repeatedly. [Product Specifications] S size: approx. 63-85cm M size: approx. 68cm-93cm L size: approx. 81cm-110cm