The Back on Track Sweater is ideal for problems in the shoulders, shoulder blades and elbows, as well as for pain in the neck and spine. As the Back on Track fabric is dependent on skin contact in order to be most effective, the top's size is less important if one is affected by pain in the shoulder region as the material always has body contact in these areas. However, it is easy for an air pocket to appear between the top and the lumbar back region when standing up. Comes in a range of sizes. (Extra Small, Small, Medium, Large, Extra Large, XX Large and XXX Large).