The low-profile Cobalt™ countered hard shell chest protector from All-Star uses 3.7mm thick HDPE pre-curved armor plates with hinges to conform to any body shape. Pre-curved shoulders allow the CPU5000 to hang on, and not slip down, for superior collarbone protection. Removable extension adds another 3.5" of seamless protection for taller officials. All armor plates have memory - form them to your own desired custom shape! Patented central cooling channel with removable and washable chest pads also allows you to swap in a dry set for a long day of tournament games. The original DeltaFlex™ harness has hookups in the front for easier on/off. The CPU5000 is 12.5" long without the optional extension, 16" with the extension attached.