We would like to purchase an ankle brace for my 12 yr. old son, but there are so many different ankle braces out there. He sprained his ankle really badly two years ago, and still has problems with it “rolling” on him even after extensive rehab. He wore the air cast up until recently, and now the doctor is recommending a lace up type brace. We would like to purchase “light” support that doesn’t inhibit movement and is comfortable, but also will prevent rolling. Any suggestions? What models seem to work the best?