A customizable fitted device for immobilizing injuries and a method for constructing the fitted device is provided. The fitted device can be used to stabilize an al 1, wrist, hand, leg, knee, ankle, foot or other body parts through custom formation. The device can be formed by a sidewall having one or more sidewall sections that can be secured together using retaining clips positioned within retaining clip slots on the device. The device can further include one or more openings defined in the sidewall of each device section while maintaining rigidity in the sidewall. The device can be constructed by of creating a 3D image scan of the particular body part in which the device will be applied, creating a design of the device to precisely match the contours of the 3D image scan, and using a 3D printer to construct the device according to the design.