Highly engineered semi-rigid lightweight brace with compression sleeve fit support for knee instabilities and ultimate body-in-motion performance. Semi-rigid support structure allows self-adaptive Flex-Fit for custom-like comfort. Bi-lateral aluminum dual axis geared hinges support with a fluid feel and natural range of motion. Sleeve-lock fit system compression sleeve wraps over brace exterior/straps adding support and fit. Advanced design with over-molded integration of anatomical lateral/medial c-supports for unique hinge bracing link.