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This is the one I have, and I've been pleased with it. There was a review on Amazon that gave some tips for setting it up that were helpful. I also had to play with the placement of the pads on the shoulder straps.
Posture Corrector for Women and Men - Upgraded Lengthened Soft Sponge Pad Adjustable Upper Back Brace for Clavicle Support and Providing Pain Relief from Neck, Back and Shoulder (Universal) [link]