Shoulder braces for inhibiting secondary anterior shoulder dislocations that are configured to allow for a wide range of motion for mobility and stabilization, include a brace body with a single arm portion configured to reside about a shoulder of a user and a torso portion, a plurality of shoulder straps extending over the single arm portion shoulder, a substantially rigid thermoplastic insert releasably held by the arm portion of the brace body. The insert can have a user-specific custom shape that substantially conforms to shoulder anatomy of the shoulder of the user. The brace can also include at least one adjustable length laterally extending torso strap attached to the torso portion.