This helps blood circulation around the lower back and dulls stiffness in the lower back. The waist belt has a special rubber weaving so that it is comfortable to wear in everyday life. Can be used with ease for those who feel uncomfortable wearing a waist belt. There are 16 1300 gauss-ferrite permanent magnets that have unique alternating arrays around the lower back. Since magnetic sheets are used, the lower back is firmly secure. Furthermore, it is removable and washable. Stiffness in the shoulders may come from backache and backache may come from the stiffness in the shoulders. We therefore recommend you wear a waist belt together with our tank top in order to achieve a triple effect of shoulders, back and lower back.