The patent discloses a crimp sleeve for the fixation of two or more sections of wire, line, or similar material to each other. The crimp sleeve consists of an outer compressible and permanently deformable layer which is hard and resistant, and an inner cushion layer, which is softer and which conforms to the sections of material to be attached to each other. The multi-layered structure of the crimp sleeve allows for secure fixation without the risk of breakage or slippage of the connection. The invention applies primarily to fishing leaders that have looped ends, but can be applied to other areas where two or more sections of wire or line need to be secured to each other by crimping.