It's just a sock, open at both ends. There is no special "elbow" support. As far as you know, you can wear it on calf/leg. It is not compressible enough like a compression sleeve and not strong enough for therapy. It's just an itchy tight band I brought back and am trying an adjustable bandage with a stiff insert. If you want real support and not just a show-off purchase (light black sleeve on your arm to pretend you're active), skip this one. Finally, there is only 1 case in the pack, not a pair. The product description was vague so please clarify this point. I don't think it was a good price and I've since used a $12 MUELLER adjustable elbow brace (same price as this product but actually adjustable). I also bought this when I wanted to carry a "sleeve" to a show and a lightweight ACE neoprene elbow brace ($7 for half the price of McDavid) for the same fancy crap. In my opinion. Of course, your mileage may vary.
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