An adjustable collar for attachment around a handle such as the handle of a baseball bat. The pocket also contains a series of high-intensity LEDs interposed between the metal strip and one of the flexible strips 1, which is reflective but allows light from the LEDs to pass through rendering the wearer more visible at night. Flanges are formed on the ends of the elongate members opposite the ends that are secured in the crease of the seat, and flanges may also be formed at one end of each of the elongate members which are transverse to the elongate members that are secured in the crease.