even after I take it off I find I am able to maintain good posture. It's really great for driving
purchased it for myself, I'm a small person, 5'4&#34; and it works for me, eliminated neck pain due to my work conditions. This would probably be tight on most adults. I'd give it 5 stars except the elastic that goes under your arms becomes itchy or somewhat uncomfortable after about five hours. But, even after I take it off I find I am able to maintain good posture. It's really great for driving,  I tend to slouch during long commutes.
Rating: 4 stars