A brace structure wearable at limb joints of a human operator is provided. The brace structure may include the central coverage area defined as an annular space by a circular knitted fabric object. A first adjustment band may extend from one end of the first stable area to be adhered to the first sticky surface. A second sticky surface and a second adjustment band may extend from one end of the second stable area to be adhered to the second sticky surface. The first stable area and the second stable area could be maintained at the upper end and the lower end of the limb joints when the first and second adjustment bands adhere to the sticky surfaces, so that the central coverage area could be maintained at the joints.
