Helps improve posture
Was having issues slouching at the work desk all day which seemed to lead to a little back pain.  Would try to catch myself slouching and try to correct my posture, but difficult to keep up.  Have only had this for a week, but it seems to help.  I have a lot less discomfort in my back and it is easier to try and maintain correct posture.  It doesn't do all the work for you, but having it on reinforces the thought of what you are trying to accomplish.  I haven't tried wearing it under my shirt, but based on how snug I pull the straps I'm guessing it would not be comfortable.  That may be more on my side since I do keep it snug.
Rating: 4 stars