The MedCline Advanced Positioning Wedge is the only wedge available on the market today with a patented arm pocket that keeps you from sliding down during the night and allows you to sleep comfortably on your side by taking the pressure off your downside arm and shoulder. The inclined + left side sleeping position created only by MedCline has been validated in 5 independent clinical trials to be the most effective for 100% natural relief from heartburn, regurgitation, coughing, choking, nausea, and the many other distressing symptoms of acid reflux/GERD, as well as providing protection from prolonged acid exposure...all while you sleep! While the left side is typically best for reflux relief, the Advanced Positioning Wedge can be used on the left or right side. The Advanced Positioning Wedge may also be helpful for shoulder relief, as the arm pocket takes the pressure of the downside arm and shoulder. We have found that customers with rotator cuff injuries, arthritic shoulders, bursitis in the shoulder, and general soreness from side-sleeping have great success with MedCline. We have found, however, that those with tears in the rotator cuff or other shoulder muscles, as well as those recovering from shoulder surgery, are less successful getting comfortable with MedCline. MedCline is not recommended for lower back or hip injuries. MedCline creates a 15 -20 degree angle so those with herniated disks, compounded disks, bulging disks, fused vertebrae or lumbar damage, arthritic hips, bursitis in the hips, or hip injuries often find it difficult to tolerate the angle that MedCline creates. The MedCline Advanced Positioning Wedge is available in three sizes. Please select the appropriate size based on your height as comfort and effectiveness are dependent on a proper fit with your torso.