When you bend your arm it hurts you elbow, you would think it has a space molded for your elbow or is padded inside, but no the inside is a flat plastic not shaped for a bent arm, so imagine that you grab a plastic sheet of about 3 or 4 mm thick place your elbow in the center and tie both ends to your arm then try bending your arm, that's exactly how it feels, and since is not shaped inside it doesn't stay in place either, I thought it could be because they were too big for me, but then I imagined how my elbow would hurt if they were tighter. Bottom line I am returning them.