This is as comfortable as one can be with something in your armpits, lol. I had purchased one before and I could not wear it whereas this one I can wear for up to five hours. It does work and my neck and shoulders definitely feel better. if you are on the borderline of the measurements that they give you for size, go with the smaller one because I was one inch less than the indicated measurement, and it is plenty big, almost too big. It is effective as it does promote me standing up straight rather than slumping. I would buy this product again and I would recommend it to others.
Rating: [5 of 5 Stars!]