Prodigy Brace (AY3-01-000) by Atlas Brace. Each Prodigy comes with Atlas Brace Jr Hybrid strap - It combines the versatile function of the common elastic "X" straps, with the comfort of a chest strap. To wear the Hybrid Strap, put it on just like a t-shirt - 1st put each arm through one of the sides, then lift it up and put your head through the middle, making sure the thinner straps end up over top of your shoulders, and the thicker straps end up around your chest. Adjust all 4 straps to the desired length - It works best when the thicker straps around your chest are sitting flat, instead of pulling at an upward angle. You can wear the Jr Hybrid strap over or under your jersey.